GMC Sierra Denali Single Cab 0.31.x

well here we are, the new denali update, this should be the last test release until the full release for free in the discord!
Added:
Crew Cab
Crew Cab Dually
New wheels
Sequential Lights (Crew Cab only at this moment, will add for single cab later)
bumper pull option (Crew Cab only at this moment, still a wip as the connection point isn't correct, works but not fully)
Jbeam work (not really an addition but did start working on the jbeam, not fully complete yet)