2x enemiez, 1/2 health

- "regular" enemy base spawnrates are doubled
- Enemy base health halved (not related to bosses, bathtub etc)
- Enemy firerates are lowered to compensate
- Loot drops are lowered to compensate
- Added speedometer option
- LegOrb enemy fixed

Why? Because it's more fun to kill a lot of enemies than to kill a few

This is playtest so might as well test it amiright