Brush.py update

Fixed erosion brush "Noise" function not working.
Fixed erosion brush messing up data values of blocks, occasionally creating checkerboard blocks.
Fixed floodfill not showing up.
Fixed floodfill brush not changing data when the block ids are identical.

Hope this is the way to do it, made my own branch and edit on that? Will I, by pressing sync in github app with my branch selected, get all new files from other peoples on my local version?