Plugins Spawn Point

- Add "Enable Update Player Height Adjust" (enabled by default) to allow moving the spawn point without affect player height. Thanks @noone77521 for the contribution!

- Align position and rotation to be exactly that of the spawn point, instead of just aligning the navigation rig
- Agressive spawn point restore on scene load (applies at the end of the loading frame, and again in the following frame)

- Integrate with Keybindings (SpawnPoint.Spawn)
- Add IsSpawnPointHost atom storable for faster atom lookup

- Spawn will adjust the player height so the head is exactly where the spawn point is
- Apply the camera pitch on Desktop to match the target
- The Z axis is now used to determine look direction