Performance and usability improvements

[Jacalz]

This is a big release featuring a bunch of improvements all over the code base. Performance and memory usage has been greatly improved in various places. There are also a few new features and usability improvements.

Changelog:

• Added support to use custom codes when sending files and folders using drag and drop (see Add a way to send using custom code when dropping files/folders #108).
• Added an option to save directory receives as a .zip file instead of automatically extracting (see Option to not extract directory receives #50).
• Added options for more easily switching to Least Authority servers to communicate with Winden and Destiny clients (see Switch to wormhole servers from Least Authority more easily #125).
• Fixed an issue where deleting a sent or received item would not close the dialog (see Deleting a send or receive should close the dialog #127).
• Improved the rendering performance for long lists of sent and received items (see Make use of new List widget item refresh #99).
• Use less CPU when dragging the options slider for selecting code components (see Use slider.OnChangeEnded API in Fyne v2.4.0 #79).
• Improved performance and memory usage when clicking on sent and received items (see Don't recreate the infomation dialog for send/receive each time #129 and Build RichText segments without parsing markdown #117).
• Using tab completion when writing the receive code is now much faster (see Optimize the generation of completion matches #136).
  • Tab completions allocates a lot less memory and uses binary search to look up matches faster.
• Receiving items now has less startup delay and has a bit less overall cpu usage.
• The highest setting for generated receive code components is now bumped from 6 to 9.
• Performance improvements to the code validation that runs when starting a receive.
• QR codes are now generated with rymdport/go-qrcode instead of skip2/go-qrcode.
  • The new dependency is a maintained fork with various modernisations, code cleanups and performance improvements.
• The magic-wormhole backend now uses rymdport/wormhole instead of psanford/wormhole-william.
  • See improvements-over-upstream for reasons.
• Go 1.19 or later is now required for compiling the application.
• Various other code refactoring and cleanup.

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