Merge branch 'develop3d' into FontProcessor
Merge branch 'develop3d' into FontProcessor
Fix for WinGL initialising GraphicsCapabilities

Seems that calling `GL.GetInteger(GetPName.MaxTextureSize, out maxTextureSize);` from a static method causes a null reference exception in OpenTK. I've worked around it by caching the _maxTextureSize in Graphics device. I've also move the getting of graphics extensions to their own method and put it in the constructor with other 'GL.GetInteger' calls rather than `Initialise()`
Merge pull request #1260 from Aranda/fix_wingl_graphicscapabilities

Fix for WinGL initialising GraphicsCapabilities
Fixing incorrect using for MONOMAC build
Merge pull request #1268 from Aranda/fix_macos_build

Fix MONOMAC build by adding missing using statement
Progress on DXT compression.
Submodule update.
Now works with AnyCPU setting.
Merge branch 'develop3d' into FontProcessor
Pointing to new ThirdParty/Libs checkout.
Updating references to .dlls.
DXTDataHandler is no longer a public class.
Throwing an exception for platforms that don't yet support texture compression.
Defining WINDOWS for Windows MGCB build.
#ifdefed around SetDLLDirectory until we come up with a solution for other platforms..
Merge pull request #1273 from SickheadGames/FontProcessor

DXT Compression implemented
Errors now go to stderr.
Fixed missing #if WINDOWS
Added built-in System and Math content type writers.
Reader type is now correctly derived from writer type.
Merge branch 'develop3d' of https://github.com/mono/MonoGame into pipeline
Merge pull request #1275 from SickheadGames/mgcb2

Small MGCB Fixes