Added option to overwrite glyph class

- option to overwrite glyph class
- script respects newer Glyphs API
Streamlined code

- script respects new Glyphs API
- much simpler structure
- deleted unnecessary code bits
Remove overlap works

- streamlined and optimized for current Glyphs API
- removing overlap now works as expected
- now restores original gridstep setting
Streamlined code

- simplified and streamlined code
- updated to take advantage of current Glyphs API
- camelcased variable names
Streamlined code

- small code improvements
- support for the current Glyphs API
Streamlined code

- small code improvements
- better support for current Glyphs API