User identification: UUID only

[mbax]

I propose that there be no interface accepting Player or OfflinePlayer so that this system is not "responsible" for any UUID lookups.

Specification should include allowing multiple types of UUID, e.g.

• Type 4: Authenticated user
• Type 3: Non-authenticated user
• Type 2: Bot/NPC/other

Possible extension to this, providing an API for UUID generation that produces plugin-unique UUIDs, such as providing 64 bits of ID (double) and the rest generated based on the plugin name or some other string:

UUID createPluginUUID(Plugin plugin, double id);

Example functionality for this:

• NPC economy accounts
• Faction/Town/Guild accounts
• Some sort of ephemeral account I don't know I'm sure there's something.

[mdcfe]

+1 to using UUIDs only and avoiding OfflinePlayer/Player - this frees us from being Bukkit-specific.

In addition to the UUID createPluginUUID(Plugin, double) helper API suggested above, @mbax also suggested a UUID createStringUUID(String, double) where the String is the namespace for flexibility (and createPluginUUID would call that method Plugin#getName on Bukkit etc).