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/NotGateTile.cpp

@@ -233,7 +233,7 @@ void NotGateTile::levelTimeChanged(Level *level, int64_t delta, int64_t newTime)
 {
 	deque<Toggle> *toggles = recentToggles[level];
 
-	if (toggles != NULL)
+	if (toggles != nullptr)
 	{
 		for (auto& toggle : *toggles)
 		{