Refactor locking of macro segments

This should avoid crashes when actions or conditions are performed in
parallel to the main macro loop and will improve the UI responsiveness
in some scenarios

lib/utils/sync-helpers.cpp

@@ -20,4 +20,36 @@ std::unique_lock<std::mutex> *GetLoopLock()
 	return GetSwitcherLoopLock();
 }
 
+PerInstanceMutex::PerInstanceMutex() {}
+
+PerInstanceMutex::~PerInstanceMutex(){};
+
+PerInstanceMutex::PerInstanceMutex(const PerInstanceMutex &) {}
+
+PerInstanceMutex &PerInstanceMutex::operator=(const PerInstanceMutex &)
+{
+	return *this;
+}
+
+PerInstanceMutex::operator std::mutex &()
+{
+	return _mtx;
+}
+
+PerInstanceMutex::operator const std::mutex &() const
+{
+	return _mtx;
+}
+
+std::lock_guard<std::mutex> Lockable::Lock()
+{
+	return std::lock_guard<std::mutex>(_mtx);
+}
+
+void Lockable::WithLock(const std::function<void()> &func)
+{
+	const auto lock = Lock();
+	func();
+}
+
 } // namespace advss