MoonBox: Sandbox zombie game

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Version 0.520
- Added resource - Ice, Gas, Stone, Crystal
- Added resource collection by engineers
- Changed model of building - Bugs lair
- Added new buildings - Mainbase, Tech factory, Resource storage, Barrack
- Changed combat and damage system
- Added force - Ice meteorite
- Changed base building system in sandbox mode - completely randomly generated building
- Added display of resources
- Added ability to build lines and rectangles from walls
- Increased performance