2.2 minor patch

- Added Kneeboard displaying some useful informations.

- Pilot gadgets like revolver and kneeboard can be clicked in flatscreen mode to grab them.

- Fixed various other bugs i have found.

- Applied crucial optimization to Unit AI's projectile calculation. Every units now have much more delayed frames for finishing trajectory calculation, and this delay increases when there are more alive units.

This greatly reduces the CPU works per frame when there are multiple units fighting each other, preventing serious frame drops.