Added WindowsGL target to platform target in Content Pipeline project
When MGCB is launched with the "LaunchDebugger" flag exceptions thrown within an importer/processor are allowed to not handled.
Clear output window when a project is closed.
Merge pull request #2934 from SickheadGames/PipelineToolMinorFix

Clear output window when a project is closed.
Merge pull request #2932 from SickheadGames/BreakWithinProcessor

'Debug Mode' Improvement
Updating the ContentManager.cs list as well
Merge pull request #2931 from AndrewCarvalho/develop

Added WindowsGL target to platform target in Content Pipeline project
Split TextureCollection into partial classes
for different graphics APIs.
Not all desktops support anisotropic
Mesa3D does not support anisotropic filtering, so check for the extension before trying to use it.
DirectX fix for anisotropic check.
Split TextureCollection into partial classes
for different graphics APIs.
Add TextureCollection partial classes for PSM and Web to definition file.
Merge branch 'texture-collection' of https://github.com/KonajuGames/MonoGame into texture-collection

Conflicts:
	Build/Projects/MonoGame.Framework.definition
Merge pull request #2936 from KonajuGames/texture-collection

Split TextureCollection into partial classes
Merge pull request #2937 from KonajuGames/anisotropic-check

Not all desktops support anisotropic