Win32: Add dynamic submenu for Postprocessing Shaders.
Fix a crash relating to switching shaders from the Win32 menu bar. Make Postprocessing Shaders menu translatable.
Remove accidentally committed cruft. Fix accidental comment edit.
Don't try to go out of bounds. Still crashes without the Framebuffer.cpp edit, though..
Make shader items checkable.
Remove hack fix for switching shaders. Create new native messages for EmuScreen to avoid threading issues. Remove gpu function calls from WndMainWindow.cpp and use NativeMessageReceived instead.
Merge pull request #4127 from thedax/win32DynamicShaderMenu

Win32: Add a dynamically-created Postprocessing Shader popup menu.