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/TheEndBiomeDecorator.cpp

@@ -58,7 +58,7 @@ void TheEndBiomeDecorator::decorate()
 	}
 	if (xo == 0 && zo == 0)
 	{
-		shared_ptr<EnderDragon> enderDragon = shared_ptr<EnderDragon>(new EnderDragon(level));
+		shared_ptr<EnderDragon> enderDragon = std::make_shared<EnderDragon>(level);
 		enderDragon->AddParts();		// 4J added
 		enderDragon->moveTo(0, 128, 0, random->nextFloat() * 360, 0);
 		level->addEntity(enderDragon);