Added missing effects from Minecraft 1.7.
Updated resource packs for 1.8 changes, with resource pack event.

Minecraft 1.8 added the ability to set the player's texture pack using not
only a URL as before, but also some identifier (ideally the SHA-1 hash of
the ZIP file to be downloaded by the client). That identifier, if an empty
string, will force the client to not consider the identifier and simply
re-download the resource pack.

The client currently has several bugs relating to resource packs and
therefore the newly added event (fired after the setting of a resource
pack) may fire illogically.
Fixed maven warnings about missing plugin version.