Dev: move ODItem into its own class in otherdrops.things package
Add: "event: explosion@player" - creates explosion at the player rather than the target (can be combined with nobreak/fire/etc - eg. explosion@player/nobreak)
Add: "events" - eg. explosion, shear, lightning - now support event@param@param in addition to event@parm/parm/etc (eg. explosion@player@nobreak works too)
Add: support for /odd x y z <item>, /odd w:world x y z <item> & /odd p:player <item> - also supports console & command blocks

* Fixes #238  (along with previous 2 commits)