0.13 and Consolidation

Marauder version 0.13 Alpha.

- Imported cleanly all new assets and didn't ruin them.

- Checked URP settings for lighting, skybox, illumination, etc.

- Removed free prototype assets which will not be used.

- Upgraded character controller look again with more quaternion shenanigans.

- Wrestled with editor performance spikes, changed garbage collection to incremental for now.

- Wiped free prototype assets from terrain.

- Started playing around with paid assets by JustCreate.

- Removed Herobrine.