Added salt item.
Added lamb and mutton that drop from baby and adult sheep.
Added salt drop for salt block.
Added placeholder sprites for salt and sheep meat.
Added generic food class.
Moved ItemPepperSeeds.java into correct folder.
Fixed a few NPEs.

Signed-off-by: deathrat <deathrat43@gmail.com>
Organized imports.

Signed-off-by: deathrat <deathrat43@gmail.com>