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.

lib/types/widget.d.ts

@@ -1,3 +1,6 @@
 export type Exclusivity = 'normal' | 'ignore' | 'exclusive';
 export type Anchor = "left" | "right" | "top" | "down";
 export type Transition = "none" | "crossfade" | "slide_right" | "slide_left" | "slide_up" | "slide_down";
+
+// Window
+export type Layouts = 'center' | 'top' | 'top-right' | 'top-center' | 'top-left' | 'bottom-left' | 'bottom-center' | 'bottom-right';