Toggle Item Frames

Complete mod rewrite for performance and maintainability.

Most Notable change:

Holding item frame will now make all invisible item frames visible, instead of those within a 10 block radius. It is now also completely completely client side.

Technical changes:

Item frames no longer have an extra nbt tag for determining whether it should be invisible, since holding an item frame is fully client side.

Upon joining a server, the mod will send a packet to the server to determine if the mod is installed on the server, and if so, determine whether or not they are the same version. If the mod is not found on the server, or their versions are not the same, then all item frames will be invisible unless an item frame is held in the player's hand.