move systray support to a plugin

[baze]

i think it would be good if you can disable the trayicon. either as an option or move the systray into a plugin, which is the better way, imho. enabled by default, though.

[zachtib]

i think it would be good if you can disable the trayicon. either as an option or move the systray into a plugin, which is the better way, imho. enabled by default, though.

I had this same thought, and probably will implement this.

Ironically, Gaim just did the exact opposite of this.