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.

globals.d.ts

@@ -1,9 +1,12 @@
 // globals.d.ts
 
-import { Variable as VariableType } from "types/variable";
+import { Options, Variable as VariableType } from "types/variable";
 
 declare global {
     var globalMousePos: VariableType<number[]>;
+    var useTheme: Function;
+    var globalWeatherVar: VariableType<Weather>;
+    var options: Options
 }
 
 export { };