Rymdport Files

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 [#108]).
• Added an option to save directory receives as a .zip file instead of automatically extracting (see [#50]).
• Added options for more easily switching to Least Authority servers to communicate with Winden and Destiny clients (see [#125]).
• Fixed an issue where deleting a sent or received item would not close the dialog (see [#127]).
• Improved the rendering performance for long lists of sent and received items (see [#99]).
• Use less CPU when dragging the options slider for selecting code components (see [#79]).
• Improved performance and memory usage when clicking on sent and received items (see [#129] and [#117]).
• Using tab completion when writing the receive code is now much faster (see [#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.