[Update] Heightmap color scheme editor (v1.93.12)

Welcome, everyone! This is small update that adds only one new feature – an ability to create a custom color scheme for a heightmap.

Using the editor UI is straightforward – you can define a series of color stops to establish a linear gradient. There's no limit to the number of colors you can use, allowing for intricate schemes, though typically 4-5 colors tend to yield optimal results.

I've also added a few new default color schemes so your map can be more versatile without need to create a custom scheme.

One of the new color schemes: olive

I hope you'll find it useful. Let me know of there are any issues with the update.