Fix crash when loading a map, going to main menu and loading another map

This avoid unnecessary copies of the fontInfo struct and allows for checking of whether the font was freed previously preventing a double free situation.
Update null_renderer.cpp to account for change in RE_RegisterFont
Update changelog.
Fix crash where client is not re-initialized after shutting down
Reactivate r_ambientScale and r_normalScale cvars.
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.
Merge tag 'v0.25.0' into gameplay/viech

Alpha 25
Make r_mergeLeafSurfaces and r_vboDeformVertexes default to on
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.
Reload map pk3s when the client disconnects
Fix an infinite loop on linux if the engine executable path is more than 64 char
Fix imagelist
Add the ability to use filters on the imagelist
Fix the /record command
No public VSay broadcasts
Use trilinear filtering by default
Newlines at the end of commands are not requires (or printfs)
Fix startup commands being processed in reverse order