install.py -> setup.py
issue #3629:new label support customize the effects such as Shadow[blur is unsupported], Outline
remove unused shader and also did adjust FontAtlas::getTexture
make setup script more smart
Merge pull request #5564 from minggo/install

make setup script smart
Merge pull request #5562 from Dhilan007/develop_label

issue #3629:new label support customize the effects such as Shadow[blur is unsupported], Outline