added more frames to the RA weapon factory doors

smoother opening animation made by Harisson
added more silo fillstep animations

made by Harisson
fixes #2660 damaged silos placed by mappers using wrong sprites
remove redundant kennel SHP added by @ScottNZ accidentily

contains no artwork fixes/polishing
added building husks for RA

refinery, construction yard and power-plants
made by Harisson
Merge pull request #3111 from Mailaender/ra-building-artwork

Red Alert building artwork polishing