Add CharacterID field to playerinfo command response

Currently, the playerinfo command returns the following info:
Name (ign)
AGID
Dinosaur (species)
Role
Marks
Growth
Location
Unfortunately, there is no way to figure out from this info (or from any other rcon command) exactly what character a player is on.

"Can't you just check the most recent PlayerRespawn webhook to get the CharacterID?"
Not always! For example, if a player hardlogs and re-enters world on a character before it despawns, then a PlayerLeave webhook is sent but NO PlayerRespawn (since the character didn't technically respawn). This creates an edge case where a player may have multiple characters spawned into the world at the same time, and there is no way to know which they most recently entered world on.

Adding a CharacterID field to the playerinfo response solves this specific issue, and in general provides bots with an easier way to access CharacterID without digging through webhook logs.