[YAGGLER/THIRD-PARTY/PNG++]: removed png++
[YAGGLER/THIRD-PARTY/LodePNG]: added lodePNG (in replacement of libpng/png++)
[YAGGLER/TEXTURE/PNG-LOADER|WRITER]: replaced png++ by lodePNG (the code looks way better \!\!)
[YAGGLER/THIRD-PARTY/LodePNG]: cmake changes for using lodePNG instead of libpng/png++
[YAGGLER/DATA/FONT]: removed freesans font.
[YAGGLER/DATA/SHADER/GBUFFER]: updated gbuffer shaders.
[YAGGLER/DATA/SHADER/TEXT]: updated text shaders.
[BLEUNW/GUI]: updated font face, renderable and gui.hpp
[YAGGLER/DATA/SHADER/TEST/EDGE]: looks better
[BLEUNW/SAMPLE/GUI-TEST]: updated the gui sample
[YAGGLER/THIRD-PARTY/LodePNG]: updated the readme for lodePNG
[KLMB/CAMERA]: fix for the ortho camera
[YAGGLER/CMAKE]: removed invalidate_version
[YAGGLER/SHADER/SHADER]: removed 'const' for dyn strings get_source
[YAGGLER/YAGGLER/GLFW WINDOW]: added the ability to add GLFW window creation hints in the constructor.
[YAGGLER/TOOLS/FONT-GENERATOR]: added the (b)font generator.