RRMod - SLS Compatibility Patch

This is the installment of patches for the RRMods "NSC 60ft Boxcar" and "33,600/700k Tank Cars.

Largely outdated so I brought it up to speed.
Below I'll list the types of rolling stock compatibalbe for this update.
Some of these may incluse reskins from Digirail.

• NSC TTX Boxcar 1-23

• NSC CP Boxcar 1-9

• NSC CSX Boxcar

• NSC LRS Boxcar

• NSC BNSF Boxcar

• NSC DWC (CN) Boxcar

• ACF 33,600G Tankcar 1-6

• ARI 33,700G Tankcar 1-3

• NSC 5810 GACX Pellet Cars 1-6

• NSC 5810 UNPX Pellet Cars 7-9

Requirements

Additional Comments

Changelog:
-Changed drag coefficients
-Removed RRMods personal wagon audio
-Added SS Freight Pack audio
-Reworked scripts so they're more efficient
-Added EDD compatibility
-Added a load variant