Steps towards light buffer saving
Increased delay between chunk copies if the server is loaded
Executes lighting in smaller pieces
Removed wait for light stable queue
Clear the console line as well

Useful in the instance that the line from the console input buffer is larger than the incoming text to the jline console.

Signed-off-by: Robert Xu <robxu9@gmail.com>
Merge pull request #2161 from robxu9/patch-1

Clear the console line as well