Added more cameos and showcase everything in developer mode

I harvested community sites again:
* Just found [Tiberian Dawn Deluxe Cameo Pack](http://www.ppmsite.com/forum/viewtopic.php?t=14518) by @Nyerguds and added the ones we did not already have except NOD flame thrower/tank, repair pad, helipad and the technology cntr.
* Instead added a cameo and high quality make animation for the tech center / prison  downloaded at http://kilkakon.com/projects.php?category=0&base=Command+and+Conquer (requires attribution) via http://cnc-comm.com/community/index.php?topic=2045.0

This also enables directly buildable construction yards in C&C and Dune 2000 when DevBuildEverything is on as @ScottNZ did for RA in commit 712b29d233f7dbf4a97e04c8eac1758df668f6e4 and I fixed the fake structures because the traits have changed (only available when cheats are on) as well as added the MRJ/MHQ units (notice that the spinner offset is not yet correct) to the build palette when cheating.