Improve usage of std::move and const references parameters

Accomplished using `run-clang-tidy` with `performance-move-const-arg,performance-unnecessary-value-param,modernize-pass-by-value`.

Changed arguments to const references, removed them where inappropriate (e.g. sink parameters). Same with std::move.

Manually reviewed each change to make sure that it makes sense, and do something more appropriate if possible.

Source/Core/DolphinQt/Debugger/WatchWidget.h

@@ -27,7 +27,7 @@ public:
   explicit WatchWidget(QWidget* parent = nullptr);
   ~WatchWidget() override;
 
-  void AddWatch(QString name, u32 addr);
+  void AddWatch(const QString& name, u32 addr);
 signals:
   void RequestMemoryBreakpoint(u32 addr);
   void ShowMemory(u32 addr);