* Add: xtask to check themes for validation warnings
* Update: tidied up runtime paths
* Update: test build workflow
* Update: address clippy lints
* Revert: only trigger workflow on push to master branch
* Add: Theme::from_keys factory method to construct theme from Toml keys
* Update: returning validation failures in Loader.load method
* Update: commented out invalid keys from affected themes
* Update: correct invalid keys so that valid styles still applied
* Update: include default and base16_default themes in check
* Update: renamed validation_failures to load_errors
* Update: introduce load_with_warnings helper function and centralise logging of theme warnings
* Update: use consistent naming throughout
* discern between rulers and whitespace, add sumiInk2
* darker background for menu and help, bold selection
* bold modifier for insert and select
* dark color for window separator
* bring ruler, whitespace, indent-guide together
* Fix kanagawa theme lint
Comprises 4 changes:
1. added "sumiInk3" as ui.cursorline.primary bg color
2. switched the cursor bg and fg colors (now in line with original theme)
3. added ui.menu and ui.selected colors
4. separated ui.selection and ui.selection.primary
* Add git gutter colors to kanagawa theme
In line with original:
autumnGreen for adds
autumnRed for deletes
autumnYellow for changes
* Add indent-guides and linenr.selected to kanagawa
* indent-guides are sumiInk4
* Add ui.linenr.selected is roninYellow
* Set ui.help bg to sumiInk1
