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_SlotList.cpp

@@ -103,7 +103,7 @@ void CXuiCtrlSlotList::SetData(int m_iPad, AbstractContainerMenu* menu, int rows
 
 		slotControl->SetUserIndex( slotControl->m_hObj,  m_iPad );
 
-		slotControl = NULL;
+		slotControl = nullptr;
 	}
 }
 
@@ -226,6 +226,6 @@ void CXuiCtrlSlotList::GetCXuiCtrlSlotItem(int itemIndex, CXuiCtrlSlotItemListIt
 	HXUIOBJ itemControl = this->GetItemControl(itemIndex);
 	VOID *pObj;
 	XuiObjectFromHandle( itemControl, &pObj );
-	*CXuiCtrlSlotItem = (CXuiCtrlSlotItemListItem *)pObj;
+	*CXuiCtrlSlotItem = static_cast<CXuiCtrlSlotItemListItem *>(pObj);
 }