Added dumpSigns command to save sign locations and text to a text file.
Added dumpSigns command to save sign locations and text to a text file.

arruda/pymclevel,ahh2131/mchisel,arruda/pymclevel,mcedit/pymclevel,ahh2131/mchisel,codewarrior0/pymclevel,mcedit/pymclevel,codewarrior0/pymclevel