Scope Data: Add keyword.declaration.variable and sub-scopes

First used via sublimehq/Packages#3911 (comment).

Author: FichteFoll

Diff for: plugins/lib/scope_data/data.py

@@ -107,6 +107,9 @@
             struct
             trait
             union
+            variable
+                constant
+                static
         import
             from
         operator