Feature: Add Windows installer using NSIS

[AnonymerNiklasistanonym]

To make the program even more accessible to someone I created a simple Windows installer based on an old NSIS template I made and backported this change to the current master of this repository.

This pull requests:

• Adds a NSIS script that:
  • Installs application to %LocalAppData%/SimpleTwitchEmoteSounds and a program data directory in %AppData%/SimpleTwitchEmoteSounds
    • Meaning the installer does only need user level privileges
  • Creates Windows start menu shortcuts to:
    • Start the binary executable
    • Open the Settings directory
    • Uninstall the application (Remove all files, optionally remove settings via a dialog)
  • Registers Windows registry keys to:
    • List it as installed application
    • List uninstall option to installed application
    • Recognize existing previous installations and automatically uninstall them before installing the current (new) version
  • Optionally adds a binary executable desktop shortcut if user checks box
  • After a successful install it starts the program automatically
• Merges the GitHub Actions tag.yml and push.yml file into one single .yml that supports the same functionality (Example run: https://github.com/AnonymerNiklasistanonym/SimpleTwitchEmoteSounds/actions/runs/11663241021)
  • Additionally it removes duplicated dotnet publish steps and instead shares them via artifacts to the release job
  • It also adds a second compilation of the program with one minor change being that the Settings (and Logs) directory is changed from a local relative location to a global default application directory so that the install directory is isolated from this data
    • This makes uninstalling and updating very easy while keeping the application data separate
• The installer also compresses the binary which makes the download file at the moment almost one third of the size (31MB -> 12MB)

Open TODOs:

• There is currently no License text that is normally added to an installer (it's a single line)
• Any directory locations/paths are nothing final but hopefully sane defaults
• To not need admin privileges while missing out on features like the previous uninstaller detection the installation directory cannot be something like %ProgramFiles% which requires such privileges which is why the %AppData% was chosen which is user specific

I'm open to change anything on request, feel free to close it if you do not want this.

[Ganom]

Apologies for the delay in looking at this PR, this seems really interesting and something I'm definitely going to look into. I've previously looked into Velopack, but this might be a better solution.