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/DisconnectedScreen.cpp

@@ -9,7 +9,7 @@ DisconnectedScreen::DisconnectedScreen(const wstring& title, const wstring reaso
     Language *language = Language::getInstance();
 
     this->title = language->getElement(title);
-    if (reasonObjects != NULL)
+    if (reasonObjects != nullptr)
 	{
         this->reason = language->getElement(reason, reasonObjects);
     }