PixelPerfectEngine-0.10.0-beta.7 released

[solidstate1991]

https://github.com/ZILtoid1991/pixelperfectengine/releases/tag/v0.10.0-beta.7

This version is okay for production, even if certain 
functionalities are either untested or unimplemented. For the 
next version, I'll finish as much of them as possible, as well as 
try to deprecate SDL2 in favor of my own, D language native 
solution, iota.