Homeworld: Ships

Adds ship sets from the Homeworld universe 17 May 2020: Updated for 2. 7.x (hopefully, I haven't thoroughly tested it since I'm not playing much Stellaris any more, but the issue with missing weapons should at least be fixed) Self service: If you want to manually resize any ship classes, change the "scale = " values in the "hw_ships_vanilla.asset" files (or the "hw_ships.asset" files for science and construction ships) to whatever you prefer. So if you change the values for a ship size from "scale = 0. 06" to "scale = 0. 12" it will be twice as big. If you want to replace a model (for example, Titans), go into the "_hw_ships_vanilla.asset", "_hw_ships.asset", "hw_starbase_entities.asset", "_colossus.asset" or "_titan_entities.asset" files, and replace the pdxmesh = " " line, for example, replace pdxmesh = "keeper_sajuuk_mesh" with pdxmesh = "hiigaran_battlecruiser_mesh". I've extracted many of the models from homeworld remastered and homeworld catacylsm, the main "mesh" references are listed at the top of the "_hw_ships.asset" files.