Converted project to x64.
Made some changes to support 64bit builds.
Removed unnessasary references to nvtt externals.
Updated source path to MGCB.
Merge branch 'develop' into mgcb64
Updated dependencies with 64bit SharpFont.
Fixed SharpFont references.
Fixed more references to the x64 versions.
More x64 fixes.
Merge pull request #2430 from SickheadGames/mgcb64

Moving To 64bit Content Building