[TS] Force explicit override & property access (#1006)

Enables TypeScript rules that improve code legibility.

- Requires `override` keyword
- Prevent indexed properties from being accessed with dot notation

```ts
const obj: Record<string, unknown> = {}

// Prefer
obj["property"]

// Over
obj.property
```

src/widgets/KnobWidget.ts

@@ -36,7 +36,7 @@ export class KnobWidget extends BaseWidget implements IKnobWidget {
     }
   }
 
-  get height(): number {
+  override get height(): number {
     return this.computedHeight || super.height
   }