Upped dev version to 2.4
Mark enemy units on map makes unit strength box red
Save 'Mark enemy units' setting
Transports for embark/disembark are now cached if player has available transports and looked up dinamically at embark. Fixed bug where only airTransports where decreased on embark. Removed unneeded carrierType define.
Cleanup unused unit images from previous scenario. cacheUnitImages() no longer reloads background image if not needed.
Added option to sort the equipment units by unit stats