CEP updated phase 1

Updated raw files on terrain, units/promotions, and buildings/economic changes based on the forum threads. Can be updated with balance feedback or as more discussion moves forward or fix outstanding issues. I tried to strip down some files to just what we have changed rather than all changes; buildings changes for now are just in one file "new", ignore the others or use them for specific changes. Working through the CAT mod to see what changes are needed to copy over to make any of these "essentials" work. Test and identify this week in full. Art for the cruiser and missile destroyer are available, those can be used instead.