VERSION 0.97.895 (31.05.2025): editor improvements and support for rgba-textures — JWildfireSwan Steam update #3725999

The main-preview now resembles the aspect ratio of the final render and the thumbnails are now displayed in a horizontal bar at the top, making more room for the main preview. I also added the possiblity in the renderer to use images (i. e. "true rgba colors") as source of color inside variations. This was a rather challenging task as there where not free channels to hold this image-rgba-colors (four components). It was done by introducing a new render pass. This render pass is only active when true colors are used and causes the renderer to be little bit slower than using no rgba-colors. There is also the possiblity to mix the rgba-colors with the fractal iteration color, causing more variation inside the image. To control this, there is a now parameter "image mix value" at the "gradient" section. When set to 0, the fractal color is completely discarded, and only the image-colors are us...