Fixed Error with level load in

Warehouse should load properly now. Humans have the textures on the
materials they should have, so does the grenade, deleted the unused
SceneTester.prefab (if you need it recreate it sorry), Put the respawn
tag on the spawn.prefab (not sure why it wasn't there, have input in.
Fixed the level load error so levels should load properly.
Input Update

The player can now move around. Later have the ability to change
controls based on preset controls.