Widget: Hold Ctrl while placing a morphable building to morph it immediately

Hold the Ctrl key while placing a Cornea, Aegis, Radar Tower or Geothermal Reactor to issue a morph order to the nanoframe upon placement (which, in turn, will make it start morphing once construction has finished).

Works with 'repeat' state on con, allowing convenient mass production of aspis without a shield fac.

https://raw.githubusercontent.com/jklw/Zero-K/hold_ctrl_to_place_and_morph/LuaUI/Widgets/cmd_hold_ctrl_to_place_and_morph.lua