Added GUI popups

I just wanted to try it but now it's implemented in a new release!
I added dialog popup windows using kdialog.
With this you don't need to input anything via keyboard anymore, just use your mouse!

Also a bug fixed where the size-only option didn't work.

Update v0.5.1

• Fixed Shortix adding prefix sizes if already present
• Shortix now removes semicolon from game names, if present, in order to use semicolons as separator for the script.

Update v0.5.0

Added an option to add the size of the target directories (both prefix and shaders).
The updater will ask you if you want it, just run it.

Update v0.4.0

Added three new featues:

• A removal script for the prefixes: You can now remove the whole prefix with one script just by drag and drop the shortcut onto the terminal window
• The installer / updater will now ask you if you want to append the prefix id to the game name, like `Game Name (12345678)'
• Shadercache will be linked, too! The shortcuts are placed in "_Shaders" within the Shortix directory.
  No need to download anything manually for updating if you already have Shortix installed. Just run the "Update Shortix" icon on your desktop.

Update v0.3.0

Contains several small changes and fixes from the latest pull requests

Update v0.2.1

Fixed systemd service not working

Update v0.2.0

New featues:

• added the ability to check for Protontricks (native and flatpak)
• added support for Non-Steam-Deck systems (tested on EndeavourOS)
• installer desktop icon will be replaced with an updater, which will get updated automatically when double clicking it (so no redownload of the .desktop file needed anymore)

Initial release

First release of Shortix. May updates come - or not (if it works as expected)