Changed stalactite breaking texture, modified water drip particles so they don't hang in midair

Removed stalactite/stalagmite breaking particles for now, they can be added back in in 1.7. 1.7 passes getIcon an IBlockAccess parameter, this will allow checking the supporting block to copy its texture.

Changed water drip particles so they no longer hang in midair before falling.
Used isStalactite instead of checking for solid blocks above so that stalagmites close to the ceiling don't drip.