Infinte Ore and Tree Clearing in the Map Editor.

[caluck]

While creating scenarios I thought there could be a couple improvements that would help:
- Clearing trees:
The only way I've seen of clearly trees, correct me if I'm wrong because I would very much like to know, is changing the terrain underneath them to water and back again.
This is rather tedious and can destroy things other than trees that were there, such as ore or other entities.

- Infinite ore:
This would be mainly aesthetic, but could save a little time instead of having to spam ores multiple times. I imagine it would be the end of the intensity slider.