Changed more file cases, and fixes to compile with wxgtk 3.0

There were more files needing renaming, and I compiled with wxgtk 3.0 rather than 2.8.  I think we might as well update to wxgtk 3.0 before releasing anything.

The code compiles now under Arch Linux, with warnings.  I think we need to get rid of those warnings as well.  Also, the code runs, but it generates assertion errors, which can be ignored.  These need to be fixed as well.  I'm happy to help clean up the warnings and assertions.