info_intermission mangle pointing the wrong way

[ericwa]

This is the reference behaviour: https://quakewiki.org/wiki/info_intermission

xxx yyy zzz, where each value is separated by a single space. xxx refers to the pitch of the camera angle. Positive values point the camera down, negative values point it up. yyy refers to the compass heading of the camera. zzz refers to the "roll" of the camera.

There are 2 problems currently in TB:

• The special case for info_intermission in EntityRotationPolicy::rotationInfo is in the "brush entity" case, needs to be moved to the "point entity"
• with that change, the pitch of TB's arrow has the wrong sign

[ericwa]

Should there just be a RotationType_Euler_PositivePitchDown for now? I can throw together a quick fix doing that.

[kduske]

It's okay for now, but we need to remove these hardcoded and Quake-specific rules from the editor and move them to the game configs at some point.

[kduske]

See also #1696