Atlased 1.1.2a released

Hello world :)
After a long time gap this is a maintenance release featuring a bunch of stability-related fixes and a particular UX improvement.

Here's the list of changes:

• Added "Update" button to the Atlas tab for synchronizing changes which were done to the image in an external editor.
• If image was updated in some external editor, Atlased now will automatically sync size changes with corresponding Atlas geometry.
• Made "please support" pop-up less annoying: it doesn't block input and its time interval has increased.
• Windows version switched toolchain from MinGW to MSVC (lesser size, better dev. infrastructure).
• Qt 5 version synced for Windows and Linux builds.
• Fixed size label not updating after image drop or load.
• Fixed crash when trying to load an Atlas with no accessible image.
• Fixed minor Undo/Redo bug involving "Rename Region" (was not affecting anything, but nice for possible future batch operations).
• Fixes for data and type conversions safety.
• Fixes for all warnings with `-Wall` and `\W4` warning levels.
• Documentation updated: made some sections less obscure (Tiled export, f.e.), fixed typos and mistakes, etc.

What's next?

The most probable path is a non-hasty bug fixing and UI/UX polishing.
After April 2023, the minimal supported Linux version will be shifted from Ubuntu 18 "Bionic" to Ubuntu 20 "Focal" due to EOL for Ubuntu 18.

Development-wise, Atlased will undergo some code refactoring to make it more extendable and maintenance-friendly,
which will allow the new features to play nicely with the existing code.

Also it is very likely that the versioning system will slightly change.

And after that - who knows :)

Thanks to all who downloaded and used Atlased and especially to those who considered supporting it by making a purchase.

See ya.