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.
* removed some redundant code
(not sure how it got there), made tracker toggle obey the variable
* Changed perspective editor from Control to PanelContainer to avoid some UI issues
This is just an added step for security. Now, if an extension file gets compromised, Pixelorama can detect the mismatch between the file's SHA256 and the SHA256 from the extension repository, and refuse to install the extension.
For example, someone with malicious intent could gain access in the repository where the extension file is hosted, and replace it with a different file. Before this commit, the malicious file would be downloaded normally, but now, since the file will change, so will its SHA-256 hash, so Pixelorama will be able detect the mismatch and recognize that it is potentially malicious.
The reason for removing the other store link is because I am worried that adding more links by default, can make it easier to compromise security. Extensions can be dangerous, and even if one link gets injected by malware, users are in danger, so I think it's better to keep the extensions is one, centralized place. I included all of the extensions listed in Variable's store link in this file.
I also renamed it from store to repository, as I think it's a more fitting name.
