Merge branch 'demo-replay-fixes' into 'next'

Demo replay fixes

Changes made/bugs fixed in this branch:
* Replay camera is now controllable when climbing (https://mb.srb2.org/showthread.php?t=38668), and in waterslides
* localangle (read: the angle between you and the camera, I think) now doesn't change during demo replays in most situations, unless the player is in analog mode. Exceptions include zoomtubes and NiGHTS super
* Replay camera now doesn't act silly if the player is in analog mode (assuming you also recorded it in that mode to begin with, anyway)

See merge request !66