Get rid of liquids when using sel cleararea

Add the ability for the baritone bot to fill in lava and water while using the `sel cleararea` command. There should be a setting to toggle whether or not it clears the liquid. It would greatly improve Baritone's ability to clear large areas, cause it almost always gets stuck up in water that hasn't been cleared, and usually ends up drowning. It also dies in lava a lot.

- [ ] Add ability for Baritone to clear lava and water when using `sel cleararea`

- [ ] Add a setting to toggle whether or not it clears liquids