Redesign lighting logic

[stdNullPtr]

Currently, for every AIR block that needs to be lit, a new BukkitRunnable is scheduled to revert it. This can introduce a significant overhead when player count arises.

Maybe we can insert all lit blocks into a queue and have a scheduler pop the last element? But each player must have a personal scheduler. This idea will be scrapped entirely in favor of lighting using packets.

Update: It turns out a lot of issues arise with the initial approach of swapping air blocks to light blocks. The lighting logic must be redesigned to use packets and properly lit a location, instead of replacing blocks with LIGHT material.