Changes

Allow fetching of NPCs using n@name instead of just n@id, useful for NPCs with unique names.
 (commit: 6b0703b)

Add "player animates" and "player drops item" world events. Add some event meta.
 (commit: 8122bee)

Add "structure grows" and "portal created" world events.
 (commit: bbcd485)

Add "chunk loads" and "chunk unloads" world events.
 (commit: d8ebf29)

Add "horse jumps", "player toggles flight", "player toggles sneak" and "player toggles sprint" world events. Add more meta.
 (commit: 30412f2)

Add "player throws egg", "player kicked" and "player shears entity" world events. Add <element.int[#]> tag for when as_int fails.
 (commit: eba9932)

Add "entity enters portal", "player dyes sheep", "sheep regrows wool" and "slime splits" world events.
 (commit: 8e49970)

Add "creeper powered", "entity changes block", "entity unleashed", "pig zapped" and "player leashes entity" world events.
 (commit: b049450)

Add "furnace burns", "furnace smelts", "piston extends", "piston retracts", etc. world events. Remove some unused imports. Some cleanup.
 (commit: dea7567)

Add "world loads", "world unloads", "world saves", "world initializes" and "spawn changes" world events.
 (commit: 213b08e)

Add "item enchanted", "inventory picks up item" and "item moved from inventory to inventory" world events.
 (commit: 7c317e2)

Make Fly command more intuitive.
 (commit: b9ca78b)

Remove chunk events for the time being, because they may be too laggy.
 (commit: a9d6020)

Small fix to Fly. Should work great now.
 (commit: 9c2121f)