Test the ArabicShaping schematic name of Arabic letters, and fix an error in the schematic name of crown ق

[eggrobin]

Fix #454.

This is a pretty ugly parser, but at least it has fairly understandable error messages, e.g.:

1. for DOTLESS BEH WITH DOT BELOW AND 3 DOTS ABOVE, given as an example in L2/11-092:

   Schematic name of U+0751: DOTLESS BEH with 1 dots BELOW should be plain BEH
   

2. for BEH WITH 2 DOTS BELOW AND DOT ABOVE:

   Schematic name of U+0754: BEH with dots BELOW should be DOTLESS
   

3. for the two iterations of wrong names in Four Arabic Pegon Characters #435:

   Schematic name of U+10EC2: Expected DAL based on Joining_Group DAL, got ARABIC LETTER DAL WITH TWO DOTS VERTICALLY BELOW
   Schematic name of U+10EC3: Expected TAH based on Joining_Group TAH, got ARABIC LETTER TAH WITH TWO DOTS VERTICALLY BELOW
   Schematic name of U+10EC4: Expected KAF based on Joining_Group KAF, got ARABIC LETTER KAF WITH TWO DOTS VERTICALLY BELOW
   

   and then

   Schematic name of U+10EC2: Expected pattern-unit, got TWO DOTS VERTICALLY BELOW
   Schematic name of U+10EC3: Expected pattern-unit, got TWO DOTS VERTICALLY BELOW
   Schematic name of U+10EC4: Expected pattern-unit, got TWO DOTS VERTICALLY BELOW
   

4. for 10EE9; DOTLESS CROWN FEH WITH TWO DOTS ABOVE; L; CROWN FEH currently in the main branch:

   Schematic name of U+10EE9: Expected pattern-unit, got TWO DOTS ABOVE