rework  CFontTexture::face & CFontTexture::library
start to rework texture_size_exception
remove dead code
more style in CFontTexture
start fix glFont (not finished so far)
use c++11's new char32_t for utf32
fix added runtime crash added by me
Merge pull request #5 from jk3064/develop

Style tweaks and start to fix bugs (added a few FIXME)