Auto api upgrade 1

First run of the automatic api updater.
Manual api upgrade 1

The ClothRenderer component doesn't exist anymore. I just commented it
out, so I need to figure out its workings and reimplement it later.
Auto api upgrade 2

Auto api updater finished without errors.
Clean up obsolete stuff

GameObject.active is obsolete
Fix rigidbody config

Prevent the script from assigning illegal values for rotation and
inertiaTensorRotation.
Update obsolete variables

Update obsolete variables (RigidBody)
FilePrefs: Create PlayerPrefs replacement

Meant to replace PlayerPrefs, so preferences are stored in files (also
on Windows).