Update PMVMatrix/GLMatrixFunc API doc and refine PMVMatrix update / get-Mvi/Mvit-Matrix operation. (Minor API change)

Using bitmask for requested Mvi and Mvit matrices,
same as dirty-bits to ease matching and update operation.

Update of Mvi and Mvit will be performed only if it's dirty-bit and request-bit set within update().
The individual dirty bit is cleared only if it's matrix update is performed.

Update is also issued at get-Mvi/Mvit-Matrix operations
to ensure proper values w/o update call w/o clearing the modified-bits.

update() returns true if the Mvi or Mvit matrix got updated
_or_ one of the modified bits is set. update() clears the modified-bits.

Adding explicit getModifiedBits() to get and clear it's state.

Adding unit test.

Lots of API docs ..

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