Implement a global phone list

[luciensadi]

Implement a phone list that:

• Keeps track of phone numbers and links them to phones without possibility of number duplication
• Allows for phone numbers to be associated with players in a global phone book of some type that works even when the player is offline
• Allows transferring numbers between phones or reclaiming them if the phone is destroyed

This will most likely need its own database table. I'm envisioning the phone having a unique idnum, which is looked up in the table, and is linked for phonebook lookups to the last person to use the phone (or the last person to run phone register or whatever).