Nothing spectacular here, fill tools are easy. Just take the dyntopo
code and repeat until nothing more to do.
The tool can be located in the dyntopo panel when the dyntopo constant
detail is on.
Also added scale factor for constant detail. This may change when detail
sampling gets in, I am not very happy with having two numbers here,
still it will give some more control for now.
Antonis Ryakiotakis
0ef416722e