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/Common/XUI/XUI_Ctrl_4JIcon.cpp

@@ -3,7 +3,7 @@
 
 HRESULT CXuiCtrl4JIcon::OnInit(XUIMessageInit *pInitData, BOOL& bHandled)
 {
-	m_hBrush=NULL;
+	m_hBrush=nullptr;
 	return S_OK;
 }