Fix stencil clear

Some drivers (especially on Android) will obey the stencil test when clearing the stencil buffer (the specs says it shouldn't). This workaround ensure that the stencil buffer will properly be cleared.
Added missing semicolon
Removing assert Pow2 from Texture.GetPitch. It is not appropriate to have this assert in the base Texture.cs file because it is platform specific whether or not this is actually a valid constraint and area already doing their own dimension validation.
Merge branch 'develop' of https://github.com/SickheadGames/MonoGame into develop
Merge pull request #2482 from prollin/patch-1

Fix stencil clear
Now using FreeImage to import Textures on Windows.
Fixed import behavior.
"Compile Include" items are imported as /build items.
"Content Include" items with a CopyToOutputDirectory value other than Never are imported as /copy items.
Added missing Microsoft.Xna.Framework.Graphics exceptions.
Changed SerializableAttribute to DataContract so it can compile on all platforms.
Updated TextureImporter with all of the file types that FreeImage supports.
Feeble attempt at formatting the massive amount of RAW image formats.
Fix for issue #1745
VertexDeclarationReader.cs now enabled for all platforms
Merge pull request #2486 from SickheadGames/DeviceLostException

Added Missing Microsoft.Xna.Framework.Graphics Exceptions
Merge pull request #2485 from SickheadGames/FreeImageSupport

FreeImage TextureImporter Support
Merge pull request #2487 from DDReaper/#1745_fix

Fix for issue #1745
Merge pull request #2490 from SickheadGames/PipelineImport

Pipeline Import Fixes
Implemented color to string converter methods. Without this method the pipelinetool can serialize a color type processor parameter.
For some reason Windows cannot build ADPCM anymore.
Reduced some of the exessive logging of repetitive information in texture processing.
We now clear the processor parameters if you try to change the processor.