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.

tsconfig.json

@@ -1,5 +1,6 @@
 {
     "compilerOptions": {
+        "noEmit": true,
         "allowImportingTsExtensions": true,
         "target": "ES2022",
         "module": "ES2022",
@@ -10,11 +11,14 @@
         "checkJs": true,
         "strict": true,
         "noImplicitAny": true,
+        "strictNullChecks": true,
+        "alwaysStrict": true,
+        "noImplicitThis": true,
         "baseUrl": ".",
         "typeRoots": [
             "types",
             "lib/types/globals",
         ],
-        "skipLibCheck": true
+        "skipLibCheck": true,
     }
 }