Begin SafeDisc 4 documentation (#354)

* Begin SafeDisc 4 documentation

Starting off with just 4.00.000 since this needed a bit more groundwork to establish with the AuthServ checks.

* Add SafeDisc 4.00.001

* Add SafeDisc 4.00.002+4.00.003

* Add SafeDisc 4.50.000 notes

* Document SafeDisc 4.60.000-4.80.000

Also add new comment about the unknown version of SecDrv.

* Document SafeDisc 4.81.000

Found a new clcd16 file, which hasn't happened in a long time

* Document SafeDisc 4.85.000 and 4.90.000

Improve some comments and detections for other versions as well.

* Document the remaining SafeDisc 4 versions

Still needs some mild cleanup

* Add SafeDisc 4.91.000 clcd32 hash

* Add SD4/Lite notes

Author: TheRogueArchivist