Added a fix for the missing Proving Grounds techs.

Added new animations for Junk SPARKs and Resistance MECs based on the SPARK, which requires Shen's Last Gift. This can be turned off for Resistance MECs in XComBUOptions.ini if you don't have that DLC. The new animations include things like sitting on the Skyranger en route to a mission, and no longer t-posing in certain cutscenes like the Alien Nest mission.

Make sure you double-check your config changes.

Now includes an option to edit what kind of corpse the Proving Grounds projects for the Resistance MEC and the Advent Drone require. You can even put something that isn't a corpse in there instead, like an Elerium Core or whatever.

I also added some extra commented-out-by-default lines into XComBUOptions.ini for if you use the [WOTC] Mec Micro Missile Launcher Color Fix mod, giving you two more cosmetic options for the Resistance MEC's Micro Missile Launcher.

Note that since I had to change XComBUOptions.ini, your options will have been set to default, so make sure you double check your changes before you hop back into your game.