Modernize project codebase (#906)

* 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

* Add safety checks and fix a issue with vector going OOR

Minecraft.Client/Common/UI/UILayer.h

@@ -61,7 +61,7 @@ public:
 	// E.g. you can keep a component active while performing navigation with other scenes on this layer
 	void showComponent(int iPad, EUIScene scene, bool show);
 	bool isComponentVisible(EUIScene scene);
-	UIScene *addComponent(int iPad, EUIScene scene, void *initData = NULL);
+	UIScene *addComponent(int iPad, EUIScene scene, void *initData = nullptr);
 	void removeComponent(EUIScene scene);
 
 	// INPUT