Add a feature to save game object localPositions and rotations

[Nicolás Uriel Navall]

Describe the issue

It would be interesting to see if we can serialize a character/NPC child game object (which often includes bones) local positions and rotations so if we were to freeze the character animation and modify its bones to pose the character, we could then load the pose in another session.

I expect this to be very janky working, but it might be fun.

[Nicolás Uriel Navall]

With the introduction of the Bones Panel on d9ebe58 this shouldn't be difficult.