Heightmap Greyscaler Tool - Initial Release

Hey everyone, I hope you find this tool helpful.

This is a simple and small app so v1.0 is likely to be the only release. I don't plan to add anything more at this time.
However, if you have any suggestions, feel free to share them. I will be incorporating them into this module as part of the Vanilla RTX ToolSuite, which the Greyscaler will eventually join with.

Personally I will be using it all the time when working on Vanilla RTX from now on, its quicker and doesn't alter what I've drawn unlike many other applications