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.Client/Common/Tutorial/Tutorial.h

@@ -139,9 +139,9 @@ public:
 	bool getCompleted( int completableId );
 
 #ifdef _XBOX
-	void changeTutorialState(eTutorial_State newState, CXuiScene *scene = NULL);
+	void changeTutorialState(eTutorial_State newState, CXuiScene *scene = nullptr);
 #else
-	void changeTutorialState(eTutorial_State newState, UIScene *scene = NULL);
+	void changeTutorialState(eTutorial_State newState, UIScene *scene = nullptr);
 #endif
 	bool isSelectedItemState();