feat(config): allow multiple asc files

This commit allows either the single canonical applications.json file,
or multiple files which adhere to the asc scheme to be given to the
app_specific_configuration_path config option.

I thought I had already implemented this earlier, but evidently I
hadn't.

This will be useful for people who want to maintain their own
independent set of asc rules, as they can be kept in a dedicated file
which won't be overwritten by the fetch-asc command.

resolve #736

komorebi-client/src/lib.rs

@@ -52,6 +52,7 @@ pub use komorebi::workspace::Workspace;
 pub use komorebi::workspace::WorkspaceGlobals;
 pub use komorebi::workspace::WorkspaceLayer;
 pub use komorebi::AnimationsConfig;
+pub use komorebi::AppSpecificConfigurationPath;
 pub use komorebi::AspectRatio;
 pub use komorebi::BorderColours;
 pub use komorebi::CrossBoundaryBehaviour;