Stinger Transitions are now Transitions

Transitions

• Stinger Transitions are now just Transitions. /rp transition <name> [player|@a] [hold ticks] plays one and /rp transitions lists them; /rp stinger and /rp stingers still work.
• Permissions are now rpengine.transition, rpengine.transition.others and rpengine.transitions. If you gave the old rpengine.stinger nodes to a group by name, give it the new ones. Ops and rpengine.admin already have them.
• For plugins: the API is transitions(), with Transitions, TransitionPlay and TransitionInfo. stingers() still works, but a plugin that names the old types needs those names changed. See Transitions.