update project file to only use no overpainting under Windows and -lGLU under *nix

Added support for overpaint-less mode since I'm having serious trouble with that

Show the version info in the about dialog properly

Added patch version number, kind of late to do this but oh well

Update the part's Name: field when saving

Prompt for unsaved changes before loading or creating a new file

Prompt for unsaved changes in the current file if it's anonymous

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mercurial