Added a brush reset operator so that a user won't need to reload the default blend to get back default brush settings * New brush.reset operator, resets a brush based on the currently-selected tool * Added UI button in the tools panel TODO: * Only resets sculpt brushes right now, other paint modes should be added * Sculpt polish tool exists only as a Brush, not as a tool; I'd suggest we make it a tool so it can be reset to defaults too