Add "connected since" and "member since" to user data

[oubiwann]

Note: user data, not livings/character data.

Use the same file that stores the password. This will require a bump in the version of the file format.

Tasks:

• [x] Bump file format version
• [x] Update user state
• [x] Update user data model
• [x] Update character state
• [x] Update character data model
• [x] Update login functions to generate these
• [x] Add server functions to extract the data
• [x] Add shell commands to query these

Depends on:

• 54

Part of:

• 34

[oubiwann]

Done.