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.World/EnderDragon.h

@@ -163,7 +163,7 @@ private:
 	EEnderdragonAction getSynchedAction();
 	int findClosestNode(double tX, double tY, double tZ);
 	int findClosestNode();
-	Path *findPath(int startIndex, int endIndex, Node *finalNode  = NULL);
+	Path *findPath(int startIndex, int endIndex, Node *finalNode  = nullptr);
 	Path *reconstruct_path(Node *from, Node *to);
 
 	void strafeAttackTarget();