Added strict type checking to the project. (#236)

* Implement strict typing (WIP).

* changes

* Finish type checks

* Fix notification icon, matugen settings and update tsconfig.

* OSD Styling updates and added the ability to configure OSD duration.

options.ts

@@ -109,6 +109,7 @@ const options = mkOptions(OPTIONS, {
         },
         osd: {
             scaling: opt(100),
+            duration: opt(2500),
             enable: opt(true),
             orientation: opt<OSDOrientation>("vertical"),
             opacity: opt(100),