Mounts megaissue

[thedax]

Since mounts were recently added, let's collect issues with that system here:

• Multi-seater mounts can't be ridden by other players yet (hinges on a capture of riding pillion)
• Mount speed on land is limited to the original speed for now, as it's unclear where the speed upgrades from MSQ/riding maps are tracked
• Crossing a zone-line while mounted into a zone where mounts are permitted dismounts you
• Teleporting while mounted into a zone where mounts are permitted dismounts you
• Diving while mounting dismounts you
• Maybe allow staying mounted if the player forcibly debug mounted?
• Attempting to dive into an underwater part of a zone will softlock until you !clearconditions, but this can't really be helped until we implement diving

Riding pillion has these issues:

• When a player zones in, and other players are already riding as passengers, the player who zoned in will not see those players riding pillion yet. (SetMode stuff is not being set in CommonSpawn)
• Crossing a zoneline while riding as a passenger will not zone you with the driver, and instead it'll leave you pseudo-softlocked until you manually dismount, zone, and then get on their mount again in the next area
• Entering an occupied seat will not relocate you to the first open seat, so multiple people can ride in the same seat, which causes issues with minimap dots/party member position syncing
• Riding pillion doesn't yet persist across zone transitions