Compatibility issue with C# < 7

[alelom]

@buka71

The following property:

CIH_Toolkit/CIH_oM/Objects/RoomObject.cs

Line 52 in 7d0972e

public List<(float, float)> Outline { get; set; }

breaks compilation for Visual Studio versions from 2017 and below. We try to use features that are a bit more compatible for everyone.

It would be good to replace that to a List<Tuple<float,float>>

[natalia-wz]

@alelom

List<Tuple<float,float>> causes conflicts within the Unity project (at compilation), I should have raised that as an issue when pushing RoomObject.cs; we can comment out the line for now and close the issue. In the future, we can follow it up with restructuring in Unity and updating RoomObject.cs to match (it won't be a list of tuples, but we can use sth else)