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
• CampusEvent.ts
• campus.ts
• compoundPath.tsx
• fastestPathCalculator.ts
• googleMapsAdapter.ts
• location.ts
• outdoorPOI.ts
• pointOfInterest.ts
• transportMode.ts
• trip.ts
• unitPath.tsx