Steam ready version (Update 1.0.0.1)

After a lot of prep work and some final clean up, we are ready for steam.
Itch.io will also get all updates though, steam is just the better plattform when it comes to reliably getting updates etc.

Steam page:
https://store.steampowered.com/app/3337800/Pngifyme/

Changes, lots of fixes and Q.O.L. improvements:

• bumped to dotnet 9, with all dependencies
• ttspet:
  • set max context (how many messages are kept in memory)
  • clear history (clear memory)
• profiles: allow import and export to a zip file
• fix search layer
• new layer: single hop on speech start
• new layer: darken (still needs some work)
• store background colour for colour picker
• lots and lots of fixes