The fullscreen functionality is kind of cool, but adds a lot of code and
as commit history has shown, plenty of bugs and extra required testing.
I may reimplement this later in a less bad manner. Note that the
fullscreen behavior can be achieved by simply increasing image size to
the max. spmenu will let you do that.
Fixes issue #9
This commit also adds MASSIVE speed improvements to image drawing, due
to code cleanup. There are still a *few* issues to resolve, one is
X11 related, and one is caused by alpha/blending.