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/FurnaceRecipes.cpp

@@ -3,7 +3,7 @@
 #include "Tile.h"
 #include "FurnaceRecipes.h"
 
-FurnaceRecipes *FurnaceRecipes::instance = NULL;
+FurnaceRecipes *FurnaceRecipes::instance = nullptr;
 
 void FurnaceRecipes::staticCtor()
 {
@@ -63,7 +63,7 @@ ItemInstance *FurnaceRecipes::getResult(int itemId)
 	{
 		return it->second;
 	}
-	return NULL;
+	return nullptr;
 }
 
 unordered_map<int, ItemInstance *> *FurnaceRecipes::getRecipies()