make LocalTransform be update packed

[dakom]

Would allow setting it without going through TRSO

[dakom]

To make it always push the values in the other direction and therefore keep everything in sync, it needs to:

1. Decompose the TRSO values and set those components as well
2. Clear those (but not other TRSO's) from their update packs

For the sake of consistent math across math libraries, the decomposition should be a function on the Matrix4 impl.

A naive first-step could be without step 2, i.e. just set the values and then let it re-propogate to the LocalTransform. This is probably more expensive than clearing the update pack list, but likely not a huge difference.

[dakom]

LocalTransform itself is now update-packed... doesn't push changes backwards though, that'll be a separate issue