Fixed/updated brush invert behavior. Holding CTRL is switches quickly how brush works:
Replace brush intensity switches to giving quick access to “replace with zero” brush;
“Smooth” mode switches to “Sharpen” and vice versa;
“Add” mode switches to “Scale” and vice versa;
Added joint selection on screen by joint position. Hit “S” and then drag mouse around: if you’re near a joint,
it will take priority over sampling a current joint from a mesh.