feat: transmo subcommand to load supplied npc model id

[Aelto]

As mentioned in #1326, the current list of NPCs to transmo into is quite limited, and manually adding NPC models to the hardcoded list can be a complicated task for those without cpp knowledge. This PR aims to add a subcommand to the transmo command: /transmo model. This subcommand accepts every parameter needed by the PendingTransmo struct, allowing anyone to transmo into the NPC model of their choice without having to edit the source code.

The command asks for specific IDs to function correctly which is pretty verbose to type, so it is mostly here to be used through chat command aliases or hotkeys.

Examples:

# transmo as Gehraz
/transmo model 4581 204020 245127 540

# transmo as Herta
/transmo model 4537 16258 245122 540

# transmo as Anzhaer
/transmo model 7985 16271 373574 520

Also as the command requires a lot of parameters it felt adequate to add a lot of error handling and logs, but if it's too much feel free to tell me!

[Irisier]

Hey, could we please add NPC Scale to the command? There are some models in the game that are nicer to use scaled.

[3vcloud]

See chat command help

[Irisier]

ok, thanks, I didn't know that /transmo can be applied to yourself with size even without a selected target