Fixed more errors related to PVS

Fixed possible clientside memory leak that might happen when an entity is created outside of a player PVS and subsequently removed without being received by that player.

Updated classmaker files (otherwise they would be incompatible with upcoming addons)

Since some poorly made addons use NPC based entities as if they were props and people keep complaining about that, I've just unlocked NPC bonemerge. Now you can bonemerge NPCs.

Fixed LUA error when external addons try to change the parent entity of a composite entity. Old constraints are removed correctly in those situations too.

Fixed panels not being hidden when switching between tools. This bug was caused by the January 2023 Gmod Update. See https://github.com/Facepunch/garrysmod-issues/issues/5398 for details.

Fixed angles not loading correctly in the editor

Fixed some child entities becoming temporarily invisible after adding them to a parent entity and disabling bonemerge.