Various Changes: Boolean Syntax, Multi Line CS Comments, Plausible New File Content, XyzStringParser, Modified XyzAutoEditStrategy

Various changes to the SDK:
- Special Boolean syntax also for EBooleanObject (not just EBoolean).
- Multi line comments in .cs files.
- New .cs files created with the wizard try to use plausible URI and file extension if .genmodel is available.
- Generation of new XyzStringParser to ease parsing of textual language artifacts without a resource/file.
- Changed XyzAutoEditStrategy to more closely resemble behavior of Eclipse editors.

See individual commit messages for more details. Please consider pulling. :)