Removed common/atomic, instead using std::atomic

Removed the need for X11 on OS X

It only causes issues when someone (who doesn't need it) doesn't have it.

CMake cleanup

Several cleanups to the buildsystem:
 - Do better factoring of common libs between platforms.
 - Add support to building on Windows.
 - Remove Qt4 support.
 - Re-sort file lists and add missing headers.

This should fix the GL loading errors that occur in some drivers due to
the use of deprecated functions by GLEW. Side benefits are more accurate
auto-completion (deprecated function and symbols don't exist) and faster
pointer loading (less entrypoints to load). In addition it removes an
external library depency, simplifying the build system a bit and
eliminating one set of binary libraries for Windows.

Fix GPU/HW synchronization

Introduce VAddr and PAddr typedefs for ARM addresses.

GPU: Improve frame synchronization, increases compatibility with both homebrew and retail applications.

Core: Cleaned up comment to be more readable.

Citra: Changed loop to be more readable.

- Useful for debugging homebrew

Qt: Updated GUI to support loading .bin files.

Fixes Citra for the latest changes made to the "refactor" branch of libctru.
- For reference, see: https://github.com/smealum/ctrulib/tree/refactor/libctru

- Useful for debugging homebrew

Qt: Updated GUI to support loading .bin files.

Downgrade GLSL version to 1.50 (compatible with GL 3.2)

VideoCore: Fixes rendering issues on Qt and corrects framebuffer output size.

Initial rewrite of opengl renderer.

Screen contents are now displayed using textured quads. This can be updated to expose an FBO once an OpenGL backend for when Pica rendering is being worked on. That FBO's texture can then be applied to the quads.

Previously, FBO blitting was used in order to display screen contents, which did not work on OS X. The new textured quad approach is less of a compatibility risk.

Further work on Pica emulation