SystemMessageAPI message codes

[Slugger]

From the javadocs for PostSystemMessage():

You may also use other user-defined message codes which should be greater than 9999. To give those messages a 'type name' which will be visible by the user; you can defined a message variable with the name 'typename' and then that will be displayed.

I'm reserving the following blocks for my plugins:

23000-23999 (inclusive): SJQv4
34000-34999 (inclusive): SageAlert
19000-19999 (inclusive): SREv3

Not sure what the ramifications are if plugins collide - I suspect it depends how these codes are used by each plugin, so I'm grabbing my blocks of message type codes now before they're gone!

Actually, it's not so much about running out, but more about being explicit about which codes I'll be using in my plugin code in case other plugins do rely on these codes for something. If I'm stealing someone's codes and it matters then the time to speak up is now. Otherwise, it might be good for all plugins to "checkin" here to reserve your block of codes, as needed.

[stuckless]

I've been using 10,000 - 10,999, for phoenix.