Prerelease of Realm Studio. Version 1.2025.99.38360

This is the second pre-release of Zero Sum Games Realm Studio. This prerelease contains numerous bug fixes, much improved performance, and new features, including functionality to create grayscale heightmaps and a 3D viewer for heightmaps (and for general viewing of 3D models), an improved architecture to better separate UI code from mapmaking code, many new themes, scaling and opacity of background and ocean textures, and random landform generation.