Merge tag 'v0.25.0' into gameplay/viech

Alpha 25
Allow jetpack to activate when falling down after a jump.
Remove battery pack. Make radar a backpack and make it use the battery pack's placeholder model.
Change magazine sizes to compensate for battery pack removal.
Reduce health for dretch (35 → 30) and mantis (80 → 75), increase mantis pounce cooldown.
Remove armageddon vote.
Make turret prefer follow-up target that it can aim at more quickly.