[WIP] Planet cracking technologies

This mod allows you to convert empty asteroids and moons to minerals, in exchange of their existence. At least something, huh? This mod is currently "work in progress" so expect some changes and more stuff in future. Added technologies : - Basic planet cracking. Allows build of "Basic planet cracker" ship type, one of they key ships of this mod. Added ships : - Basic planet cracker. Only surveyed asteroids and small moons can be cracked. You can cancel and continue cracking anytime. To begin, build planet cracker and orbit it to the target body. Then choose a cracking speed.