Use static `LocalVectors` instead of `PoolVectors` for temporaries.

…rm()`

* Moves 3D Camera interpolation scene side.
* Automatically switches `get_camera_transform()` to report interpolated transform during `_process()`.
* Fixes `ClippedCamera` to work with physics interpolation.

[3.x] Faster editor grid

2D skinning required the interpolated skeleton base transform to be updated when using interpolation.

[3.x] Physics Interpolation - refactor `Camera` and fix `get_camera_transform()`

[3.x] Physics Interpolation - Fix 2D skinning

* Move client interpolation pump to earlier in the iteration before 3D physics synced
* Allow `get_global_transform_interpolated()` to prime the client interpolation inside a physics tick

[3.x] Physics Interpolation - refactor client interpolation pump