v0.8-alpha

• Fixed a crash when too many objects were created
• Fixed the pre-mission screen disappearing too quickly
• Added graphics for unexploded mines
• Added more tank sprites to the mission start screen and the results screen
• Fixed a bug where you could only lay one mine per mission
• Fixed tanks clipping through blocks when pushed
• Added a pause menu (open with + for now)
• Fixed the mine radius check
• Removed the level pack from the game itself
• Various performance optimizations