feat(themes): update bar on komorebi.json reload

This commit ensures that whenever komorebi.json is updated, komorebi-bar
will try to apply whichever theme is set in that file by the user (if
one is set).

Similarly, if a theme is not set in komorebi.bar.json, komorebi-bar will
load the theme set in komorebi.json (if one is set).

A new configuration "bar_accent" has been added to the KomorebiTheme
struct to make this process as uniform as possible.

komorebi-client/src/lib.rs

@@ -36,6 +36,7 @@ pub use komorebi::window_manager_event::WindowManagerEvent;
 pub use komorebi::workspace::Workspace;
 pub use komorebi::BorderColours;
 pub use komorebi::GlobalState;
+pub use komorebi::KomorebiTheme;
 pub use komorebi::Notification;
 pub use komorebi::NotificationEvent;
 pub use komorebi::RuleDebug;