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_Chat.cpp

@@ -5,7 +5,7 @@
 
 HRESULT CScene_Chat::OnInit( XUIMessageInit* pInitData, BOOL& bHandled )
 {
-	m_iPad = *(int *)pInitData->pvInitData;
+	m_iPad = *static_cast<int *>(pInitData->pvInitData);
 
 	MapChildControls();
 
@@ -37,7 +37,7 @@ HRESULT CScene_Chat::OnTimer( XUIMessageTimer *pXUIMessageTimer, BOOL &bHandled)
 			m_Labels[i].SetOpacity(0);
 		}
 	}
-	if(pMinecraft->localplayers[m_iPad]!= NULL)
+	if(pMinecraft->localplayers[m_iPad]!= nullptr)
 	{
 		m_Jukebox.SetText( pGui->getJukeboxMessage(m_iPad).c_str() );
 		m_Jukebox.SetOpacity( pGui->getJukeboxOpacity(m_iPad) );