Clean up framebuffer abstraction #64
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As previously promised, this PR provides a higher-level way to use the GOP's framebuffer that is more ergonomic than raw pointers (though still unsafe, due to pixel format requirements).
Compared to the pointer-based access method, which remains available, the new methods...
As compilers can be (rightfully) conservative about multi-byte volatile reads and writes, an interface to easily perform these is provided.