Oject keeping track if so called features

[12xx12]

Vanilla minecraft does keep track where it placed which structure (so called features).

I think this would make sense to add this too to cuberite. Features that need this:

- Limit mob spawning to locations (villagers, ...)
- eye of ender of fly route

Functions I would add to the object:

Code:

enum class eFeatures
{
    // List of all vanilla features...
};

bool IsFeatureAt(Vector3i, eFeature);
Vector3i GetNearestFeature(Vector3i, eFeature);
std::vector<Vector3i> GetAllFeatures(eFeatures);