Use proper Typescript practices for setters and getters

[wltrf]

The classes under ./classes all implement the setProp() and getProp() methods while also leaving the property itself public. This should be changed to follow proper practices which looks like the following:

private _value : string;
public get value() : string {
  return this._value;
}
public set value(v : string) {
  this._value = v;
}

This allows to call the prop directly as if it was a public property, but in the background it actually calls the proper set or get methods. E.g. calling instance.prop="test" will be actually call the set method.

[wltrf]

• [ ] building.ts
• [x] CampusEvent.ts
• [ ] campus.ts
• [ ] compoundPath.tsx
• [ ] fastestPathCalculator.ts
• [ ] googleMapsAdapter.ts
• [ ] location.ts
• [ ] outdoorPOI.ts
• [ ] pointOfInterest.ts
• [ ] transportMode.ts
• [ ] trip.ts
• [ ] unitPath.tsx