Spectra-lexer

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* Fixed focus and tab issues in the Qt GUI
* Improved Discord rule info tree appearance

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* Moved Discord client code into project
* Added phrase lookup and interactive pages to Discord bot
* Refactored HTTP client to use Fetch API
* Improved GUI startup exception handling
* Added more rules for symbol characters
* Reduced precedence of split-stroke rules

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* Fixed Plover plugin activation and shortcut
* Updated Discord bot dependency

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* Fixed object tree icons

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* Code has fewer implicit dependencies (especially in the GUI)
* Configuration is now easier to maintain

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* Added arrow-delimited queries to Discord bot
* Python console exceptions are handled better