[FR] heightmap brush

[inxomnyaa]

Describe the feature you want here
Fawe got a heightmap brush
https://camo.githubusercontent.com/9302718133389ab95e62a491d5c4fd8433454d36/68747470733a2f2f692e696d6775722e636f6d2f574b7775426c4f2e6a7067
This should be easily reproducible, especially with forms