Project modernization (#630)

* Fixed boats falling and a TP glitch #266

* Replaced every C-style cast with C++ ones

* Replaced every C-style cast with C++ ones

* Fixed boats falling and a TP glitch #266

* Updated NULL to nullptr and fixing some type issues

* Modernized and fixed a few bugs

- Replaced most instances of `NULL` with `nullptr`.
- Replaced most `shared_ptr(new ...)` with `make_shared`.
- Removed the `nullptr` macro as it was interfering with the actual nullptr keyword in some instances.

* Fixing more conflicts

* Replace int loops with size_t and start work on overrides

Minecraft.World/ZoomLayer.cpp

@@ -86,7 +86,7 @@ shared_ptr<Layer>ZoomLayer::zoom(int64_t seed, shared_ptr<Layer> sup, int count)
 	shared_ptr<Layer>result = sup;
 	for (int i = 0; i < count; i++)
 	{
-		result = shared_ptr<Layer>(new ZoomLayer(seed + i, result));
+		result = std::make_shared<ZoomLayer>(seed + i, result);
 	}
 	return result;
 }