Appearance jammy (#78)

* chore(appearance): add interface i18n phrases

* wip: appearance page skeleton

* wip: more work on the skeletop

* wip: appearance

* wip: add icons and more widgets to appearance page

* wip: set the theme on entering and leaving the appearance panel

* cleanup & layout improvements

* wip(appearance): accent buttons

* fixes

fix default schemas, install methods, and appearance page

* use git deps

* clippy and cleanup

* update libcosmic & fix illustration names

* feat: cosmic-comp theme variables

* use git deps

* fix: add dep to control

* fix: install libwayland-dev

* udpate libcosmic

* wip: reset to default button

* refactor: color button improvements

* feat: import / export themes

* refactor: defaults for most color pickers and toggle for window hint

* refactor: use a context drawer for the container background color

* cleanup(appearance): box ThemeBuilder in Message

* cleanup(appearance): clippy

* fix(appearance): window hint toggle handling

* chore: more entries for the default schema

* fix: typo

resources/icons/scalable/status/illustration-appearance-light-style-slightly-round.svg

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