Update changelog.
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.
Change Lightgrid interpolation to match q3 more.

The directed light intensity is interpolated now without consideration of its
direction. That may be physically less plausible, but otherwise directed
lighting can get turned down too much.
Fix lightvector scaling.
Fill in lightgrid samples in walls with interpolated values.

The 3d texture cannot skip samples in walls, so to avoid darkening
of entities near walls and floors there should be light samples inside
walls.
Fix a typo inside ReadLightGrid. This fixes the flickering effect experienced on nvidia hardware.
Normalize r_ambientScale and r_normalScale, remove the CVAR_CHEAT flag of the latter.
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.
Change a few default cvar values in the gamelogic.
Let r_AmbientScale scale the outgoing diffuse light.

The incoming directional light creates some diffuse output too,
this change allows to set r_ambientScale to 0 and get only the
specular reflections.
Reload map pk3s when the client disconnects
Fix the /record command
Newlines at the end of commands are not requires (or printfs)
Fix key-down+key-up mis-ordering when both occur in the same frame.
Fix sub-frame input handling.

This needs IN_Frame() to be called often, maybe more than once per frame.
Timestamps reflect when this was called rather than the actual event times,
so we work around this by calling it from within the delay loop in
Com_Frame(). Wake-up within that loop is approx. every 50ms, so the
minimum calling frequency should be 20Hz.