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/BoundingBox.cpp

@@ -115,7 +115,7 @@ BoundingBox *BoundingBox::getIntersection(BoundingBox *other)
 {
 	if (!intersects(other))
 	{
-		return NULL;
+		return nullptr;
 	}
 	BoundingBox *result = new BoundingBox();
 	result->x0 = Math::_max(x0, other->x0);