FMSLogo Code

Remove gbm_find_word and gbm_find_word_prefix
These functions were not used by FMSLogo and needlessly contributed to size and maintainence cost.

Fix the GIF* API to accept Unicode filenames.

The gbm subsystem which implements GIF used the POSIX I/O functions (open(), read(), write(), etc.), so this involved porting it to use the C stdio routines (fopen(), fread(), fwrite(), etc.) and using wxFopen, which supports wide characters. It also involved changing an int file descriptor to FILE* and using wchar_t instead of char wherever filename are used. As a result, the files underwent sweeping changes, even if only a few are significant.

Add a test for calling GIFSIZE on a filename with non-ASCII characters.

Remove an unneeded "check_throwing" from lcount()

Add regression tests for COUNT

Add some additional bad input tests to DLLCALL.
These cover new logic added for supporting Unicode.

Replace make_strnode with make_static_strnode where appropriate.
This is slightly faster and uses slightly less memory.

Add a function comment to make_static_strnode()

Remove redundant computation from mend_nosemi()

Remove some redundant computation from mend_strnzcpy