Exit with error if texture missing patch

Because its only going to cause a crash later.

Update releasenotes.md

Minor tweaks to p_spec.c

Fix potential crash using thinglist CCMD

Revert a previous commit

Don't reset player angle when exiting menu

As well as reducing jitter a bit.

More minor tweaks

Minor tweaks

More minor tweaks

Check correct CVAR when spawning player in liquid