Moved convar check for hud

- Mass backend update
- Removed excess skins for disk space

- Missile speed increase, because it apparently was slow.

- Removed old exhaust particle flames
- Removed all usage of Lerp()

- Added support for new afterburner effect
- Increased missile speed and turn rate
- Changed top speed and health
- Corrected nozzle animation

- Added gib models

- Added pilot for when aircraft NPC-controlled

- Engine effect update

None Provided

- Fading alpha for custom HUD

- Stats update. If you still find it hard to fly, you just suck at flying