Scene scattering tool

This plugin adds tools to help placing many scene instances in an environment by “painting” over it, rather than dragging and dropping them manually from the file system dock.

It adds a new node `Scatter3D`. Add it to the scene, add scenes you wish to be able to paint into the list, and start placing them.

Changes in 1.0.1:

– Fixed error when painting on an HTerrain plugin node
– Fixed placement error caused by bad raycasting call