Mod adds clientside /eyethrow command

Usage guide:

1. Throw eye and point camera on it
2. run /eyethrow register, it will print id of throw
3. Walk away from first throw 100-200 blocks
4. Repeat steps 1 and 2
5. run /eyethrow calculate throwid1 throwid2.

Mod will print approximate coordinates of stronghold.

Mod works similar way to ninjabrain bot, but uses only intersection of two throws in calculation, so it is not so accurate.