ofTrueTypeFont: fix spacing, kerning, hinting and clean code. Closes #2787
breaklines
Merge branch 'master' of github.com:openframeworks/openFrameworks into bugfix-truetypeKerning

Conflicts:
	libs/openFrameworks/graphics/ofTrueTypeFont.cpp
	libs/openFrameworks/graphics/ofTrueTypeFont.h
Merge pull request #2790 from arturoc/bugfix-truetypeKerning

truetype fixes for kerning, hinting and spacing