optimized Drawable (WIP)
fixes compilation and tests
Drawable call DrawableImpl (WIP)
Drawable call DrawableImpl
fix DrawableImpl
optimized DrawableImpl::scr_blt
code cleaning
code cleaning
Drawable: type color is Color instead of uint32_t
added const qualifier and Drawable use a private inheritance on DrawableImpl
fixed missing-declarations warning
Merge branch 'future' of https://github.com/wallix/redemption into newdrawable

merge future