Merge branch 'develop' into fbxfix
Fixed bug as positions are not required and positionIndices are.
Fixed IndirectPositionCollection to correctly reference the position data from the GeometryContent... hence indirect.
VertexBufferContent can now write any struct vertex format.
Added support for ArrayWriter<> to ContentWriter/ContentCompiler.
Fixed ArrayWriter to properly serialize the runtime reader.
The position collection is read only.
Synced up project files.
Merge branch 'fbxfix' into stable_BtA