[2.0] More refactorings in Annotations parser and DQL parser. Now they only use constants instead of string processment

[2.0] DDC-78 - Added support for context specific information in Annotation Parser Syntax Error Exceptions.

[2.0] Added test that shows AnnotationParser only parses string literals with double quotes, wheras single quotes throw an Syntax Error. Removed debug output on failure for a proper syntax error exception.

[2.0] Grammar rule fixes to prevent possibility to do key=field=identifier as a correct parseable grammar

[2.0] Applied fixes for character casing issues. Simplified inheritance mapping and improved handling of outer joins in Class Table Inheritance.

[2.0] Some Annotations parser docblocks, optimizations, etc. Fixed wrong syntax error token report in DQL parser

[2.0] New Annotation API work: Simplifications, changed namespace separator to match the one of PHP, adjusted Lexer to swallow any * characters outside of a string value to be more forgiving when it comes to formatting.

[2.0] Moved cache drivers to Common package. Added new annotation parser implementation to Common package. AnnotationDriver in ORM not yet migrated.