Beta Semi-truck reverse parking scenarios 1.3

-Each mission now has competitive scenario properties (cant respawn, use node grabber etc) when you have the option ticked in the gameplay settings.

-Player vehicle that wasn't supposed to be there was removed in all scenarios.

-Fixed a bug in the 3rd mission that would auto-fail you.

-Fixed bug in 3rd mission where one of the "customer" trucks wasn't spawned at all.

-Changed the trailer position in 3rd mission so it's easier to grab and go. The hard part should be parking the trailer, not picking it up.

Working on some more missions but wanted to put this fix out asap