S397 & URD IMSA 2019 GTLM pack 1.6

- Fixed crashes on the #3, #4 & #25 thanks to @bears

bears investigated the bug and was able to figure out the crashes were caused by the classes line in the veh file. Either there is a limit with the number of classes or the parser is reaching its limit of characters per line.
This update provides a workaround by splitting the cars in two nearly identical versions with one for the endurance races and one for the sprint cup races.
Make sure to pick the right one!

This is the last version supporting RFCMP installation. Simply can't ensure to keep them up to date anymore.
Check out the readme file for installation instructions.

- Added MAS installation support

Be sure to uninstall and delete the old rfcmp-package und restart the game before installing the new versions rfcmp-file.

- Updated to the new versions of the S397 cars

- Added the #62 Risi Competizione Ferrari 488 GTLM

- Added the possibility to install the URD Detroit skins by virtual drivers

Don't install virtual drivers if you've installed the skins successfully by the rfcmp file already.

- The pack now includes realistic opponent filters for AI racing, see opener
- Porsche classic liveries are accurate now

Be sure to uninstall and delete the old rfcmp-package und restart the game before installing the new versions rfcmp-file.

- Updated the URD Detroit rfcmp file thanks to @Dj Noize so it should work for everyone with the latest URD update now