Added new TargetBlendState class.
BlendState class extended to support optional per-target blend states under DX.
Added overloaded BlendState.Dispose(bool).
Merge branch 'develop' into dxblend
The blend properties are only set on the primary target now.
Fix RenderTarget creation if called from non UI thread
Game now correctly disposed on exit of the activity
Game can now be exited and re-launched on Android multiple times without errors.
Remove test code.
Fix non-Android compile error.
Fixed a bug in the ContentWriter.cs where when processing List<T> types it
failed to find the correct TypeWriter
Merge pull request #1969 from dellis1972/develop

Fixed a bug in the ContentWriter.cs where when processing List<T> types
Merge pull request #1964 from KonajuGames/game-dispose

Game now correctly disposed on exit of the activity
Fix Windows build issue
Merge pull request #1959 from flyingdevelopmentstudio/RenderTarget2D-multithread_fix

Fix RenderTarget creation if called from non UI thread
Merge pull request #1906 from SickheadGames/dxblend

Independent Blend States
Merge branch 'develop' of https://github.com/MichaelDePiazzi/MonoGame into ext-framebuffer