Added the missing pyserial dependency, sorry it took so long!

Everything is in a working state

Updated the tests in accordance with several API changes

Finished the settings menu, updated the docs for adding a settings widget. Just about to fix the tests

Almost done with the plugin settings

Started working on the settings menu, fixed the relaunch capability

No longer separately reporting errors for global and local plugins. Reversed the terminology around global and local plugins. Global plugins go in the plugins directory, which local plugins are installed via pip. Local plugins shadow global plugins so you can have multiple isolated Fabrial installations that share some plugins. Implemented the settings widget entry point.

Removed a debugging line

Moved more things to `legacy`, figured out how to create an application shortcut from Python, removed packaging files (we are no longer supporting a Windows installer)

Updated the README

Updated the plugin guide to reflect the new `plugins` folder location

Moved old assets into `legacy`

Restored an icon that was accidentally removed

Moved the `legacy` folder out of the package. Starting a sequence now makes the items readonly

Re-did the plugin loading system to support disabling plugins. Need to update tests and finish the settings entry point