Add optional alignment to pixels when using halign/valign. Should *probably* be defaulted to on.
Add optional alignment to pixels when using halign/valign. Should
*probably* be defaulted to on.

oktayacikalin/pyglet,theblacklion/pyglet,theblacklion/pyglet,theblacklion/pyglet,oktayacikalin/pyglet,mammadori/pyglet,mammadori/pyglet,mammadori/pyglet,theblacklion/pyglet,oktayacikalin/pyglet,theblacklion/pyglet,mammadori/pyglet,oktayacikalin/pyglet,oktayacikalin/pyglet