Elm: Rewritten using PackCC PEG parser (#3312)

* Elm: Rewritten using PackCC PEG parser.

* Tmain: Update tests for new Elm parser

* refactor: Remove Elm source generated by build system

* Elm: Fix parser error causing assertion failure.

Error reported is

```
ctags: main/numarray.c:178: intArrayRemoveLast: Assertion `current->count > 0' failed.
```

caused by unbalanced SET_SCOPE/POP_KIND. Thanks to Masaktake Yamato for
[finding the
cause](#3312 (review)).

* Elm,cosmetic: Add links in comments language reference.

* Style: Update generated win32 VS2013 files

Following an earlier comment, committed files generated
by `make -BC win32`.

Earlier comment is:
#3312 (comment)

* Elm,refactor: Use helper function for brevity.

* Elm: signature field becomes typeref:description field.

* Elm: Typerefs for constructors correctly include arrows.

* Elm: Function parameters appear as ctags signature.

* Elm: Misc fixes, including description -> typename.

- (Format) typeref:description: -> typeref:typename:
- (Refactor) Use isspace() for clarity.
- (Man page) Man page passes `make man-test`.
- (Comments) Remove incorrect task in comments.
- (Comments) Add thanks in comments.

Author: niksilver

Tmain/list-fields-with-prefix.d/stdout-expected.txt

@@ -19,6 +19,7 @@ x       UCTAGSxpath          no      NONE             s--    no    -- xpath for
 -       UCTAGSmacrodef       no      CPreProcessor    s--    no    -- macro definition
 -       UCTAGSmacrodef       no      CUDA             s--    no    -- macro definition
 -       UCTAGSproperties     no      CUDA             s--    no    -- properties (static, inline, mutable,...)
+-       UCTAGSmoduleName     yes     Elm              s--    no    -- actual name of renamed module
 -       UCTAGSannotations    yes     GDScript         s--    no    -- annotations on functions and variables
 -       UCTAGShowImported    no      Go               s--    no    -- how the package is imported ("inline" for `.' or "init" for `_')
 -       UCTAGSpackage        yes     Go               s--    no    -- the real package specified by the package name

Tmain/list-fields.d/stdout-expected.txt

@@ -37,6 +37,7 @@ z	kind	no	NONE	s--	no	r-	[tags output] prepend "kind:" to k/ (or K/) field outpu
 -	macrodef	no	CPreProcessor	s--	no	--	macro definition
 -	macrodef	no	CUDA	s--	no	--	macro definition
 -	properties	no	CUDA	s--	no	--	properties (static, inline, mutable,...)
+-	moduleName	yes	Elm	s--	no	--	actual name of renamed module
 -	annotations	yes	GDScript	s--	no	--	annotations on functions and variables
 -	howImported	no	Go	s--	no	--	how the package is imported ("inline" for `.' or "init" for `_')
 -	package	yes	Go	s--	no	--	the real package specified by the package name

Tmain/list-roles.d/stdout-expected.txt

@@ -40,7 +40,10 @@ DTD            e/element         attOwner           on      attributes owner
 DTD            p/parameterEntity condition          on      conditions
 DTD            p/parameterEntity elementName        on      element names
 DTD            p/parameterEntity partOfAttDef       on      part of attribute definition
-Elm            m/module          imported           on      imported module
+Elm            c/constructor     imported           on      item imported
+Elm            f/function        imported           on      item imported
+Elm            m/module          imported           on      item imported
+Elm            t/type            imported           on      item imported
 Flex           I/import          import             on      imports
 GDScript       c/class           extended           on      used as a base class for extending
 GemSpec        g/gem             develDep           on      specifying development dependency
@@ -145,7 +148,10 @@ DTD            e/element         attOwner           on      attributes owner
 DTD            p/parameterEntity condition          on      conditions
 DTD            p/parameterEntity elementName        on      element names
 DTD            p/parameterEntity partOfAttDef       on      part of attribute definition
-Elm            m/module          imported           on      imported module
+Elm            c/constructor     imported           on      item imported
+Elm            f/function        imported           on      item imported
+Elm            m/module          imported           on      item imported
+Elm            t/type            imported           on      item imported
 Flex           I/import          import             on      imports
 GDScript       c/class           extended           on      used as a base class for extending
 GemSpec        g/gem             develDep           on      specifying development dependency

Units/parser-elm.r/elm-aliases.d/args.ctags

@@ -0,0 +1,2 @@
+--sort=no
+--fields=+r

Units/parser-elm.r/elm-aliases.d/expected.tags

@@ -0,0 +1,3 @@
+MyAlias1	input.elm	/^type alias MyAlias1 = String$/;"	a	roles:def
+MyAlias2	input.elm	/^type alias MyAlias2 =$/;"	a	roles:def
+MyAlias3	input.elm	/^    MyAlias3$/;"	a	roles:def

Units/parser-elm.r/elm-aliases.d/input.elm

@@ -0,0 +1,11 @@
+type alias MyAlias1 = String
+
+type alias MyAlias2 =
+    String
+
+type
+    alias
+    MyAlias3
+    =
+    { x:Float, y:Float }
+

Units/simple-elm.d/args.ctags renamed to Units/parser-elm.r/elm-bad-lines.d/args.ctags

@@ -1,3 +1,3 @@
 --sort=no
---fields=+r
 --extras=+r
+--fields=+r

Units/parser-elm.r/elm-bad-lines.d/expected.tags

@@ -0,0 +1,8 @@
+Input	input.elm	/^import Input exposing (..)$/;"	m	roles:imported
+input1a	input-1.elm	/^input1a = 1$/;"	f	roles:def
+input1b	input-1.elm	/^input1b = 2$/;"	f	typeref:typename:Int	roles:def
+input2b	input-2.elm	/^input2b = 1$/;"	f	roles:def
+input2c	input-2.elm	/^input2c = 3$/;"	f	roles:def
+module2d	input-2.elm	/^module2d = 4$/;"	f	roles:def
+input3b	input-3.elm	/^input3b = 1$/;"	f	roles:def
+input3d	input-3.elm	/^input3d = 1$/;"	f	roles:def

Units/parser-elm.r/elm-bad-lines.d/input-1.elm

@@ -0,0 +1,8 @@
+type alias Input1a *= ConsA
+
+input1a = 1
+
+type alias Input1b *= ConsB
+
+input1b : Int
+input1b = 2

Units/parser-elm.r/elm-bad-lines.d/input-2.elm

@@ -0,0 +1,9 @@
+type Input2a = Cons2A1 | Cons2A2 *
+
+input2b = 1
+
+module = 2
+
+input2c = 3
+
+module2d = 4