Thanks to https://godotshaders.com/shader/color-manipulator/
The shader has more options than just brightness and contrast though, but I didn't know how else to name the effect. "Adjust Brightness/Contrast" makes it immediately obvious as to what the effect is about.
Closes #1061, fixes issue where when Pixelorama's window loses focus, the dialogs disappeared, but the dialogs can no longer close when pressing outside of them.
Before this commit, when these tools were being used on large areas, the software would start being very slow due to the polyline drawing. Now it simply draws an image.
TODO:
- Optimize the lasso, pixel and polygon select tools
- Mirror the previews of ellipse selection and shape tools, for consistency with the lasso, pixel and polygon select tools
- Perhaps somehow remove Previews.gd since its work is even more limited now.
* splash ambient
* change fill to radial
* make import tag work with frame button
* hide Import tag dialog when clicking outside
* Icon shows the first frame of a tag
* formatting
Added missing strings to Translations.pot and fixed a few ones that were broken either because of missing periods, differences in capitalization or because of trailing newlines (the latter seems to get automatically trimmed in tooltips during runtime)
A few buttons and labels in Pixelorama weren't getting updated when changing languages, they'd just remain at the language the program started up with or only update when changing projects.
This fixes that and ensures they get updated as soon as the user changes languages.
This has no effect on non-Steam builds. Steam achievements are mostly for fun, but can also be educational because they can let users know of certain features and functionalities. It's using the GodotSteam GDExtension, but because I do not want to bloat the GitHub repository with things that are not needed for most builds, I decided not to include the GDExtension files, and instead check if the `Steam` class exists in `ClassDB`. The new SteamManager class pretty much does nothing on non-Steam builds, so do not worry about bloat.
In the future we could even take advantage of more of Steam's features, such as Cloud storage for pxo files.
