Extracted API-specific methods from GraphicsDevice
Copy GraphicsDevice.cs to API-specific files
GraphicsDevice API split
Whoops! Sloppy rename.
Collapse one-line if-endif-if to if-else
Fix accidental extra present on Win8
Retry double-present fix.
Merge pull request #2243 from SickheadGames/GraphicsDeviceSplit

Split GraphicsDevice on a per-API basis