Implemented abstract declarators and fixed unnamed parameters.
Changed Symbol into a concrete class instead of interface.
Added .b91/.k91 files to .gitignore.
Parsing functions using full declarator syntax (allows returning pointers).
Code formatting.
Set symbol global name when adding to a scope, and manual "__" prefix for
internal symbols.
Parser support for declaration specifiers.
Storage class for symbols.
Finished implementation of function pointers.
Comma expressions.
Fix: parsing the semicolon in do statements.
Wrote more test cases for loops and break/continue.
Fix: forbid assignment and comparison between void* and function pointer
Fix: allow unnamed parameters in return value function declarators.
Fix: generating unique internal names when multiple unnamed parameters.
Fix: don't allow relational operators between function pointers.
Tests for function declarators and function pointers.
Fix: comma expression must return decayed type
Tests for comma expression.
Tests for declaration specifiers.