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/ShapelessRecipy.cpp

@@ -73,7 +73,7 @@ shared_ptr<ItemInstance> ShapelessRecipy::assemble(shared_ptr<CraftingContainer>
 
 int ShapelessRecipy::size() 
 {
-	return (int)ingredients->size();
+	return static_cast<int>(ingredients->size());
 }
 
 // 4J-PB