Add CheatEngine and support for Gateway cheats (#4406)

* Add CheatEngine; Add support for Gateway cheats; Add Cheat UI

* fix a potential crash on some systems

* fix substr with negative length

* Add Joker to the NonOp comp handling

* Fixup JokerOp

* minor fixup in patchop; add todo for nested loops

* Add comment for PadState member variable in HID

* fix: stol to stoul in parsing cheat file

* fix misplaced parsing of values; fix patchop code

* add missing break

* Make read_func and write_func a template parameter

src/core/hle/service/hid/hid.cpp

@@ -74,7 +74,6 @@ void Module::UpdatePadCallback(u64 userdata, s64 cycles_late) {
     if (is_device_reload_pending.exchange(false))
         LoadInputDevices();
 
-    PadState state;
     using namespace Settings::NativeButton;
     state.a.Assign(buttons[A - BUTTON_HID_BEGIN]->GetStatus());
     state.b.Assign(buttons[B - BUTTON_HID_BEGIN]->GetStatus());
@@ -394,6 +393,10 @@ void Module::ReloadInputDevices() {
     is_device_reload_pending.store(true);
 }
 
+const PadState& Module::GetState() const {
+    return state;
+}
+
 std::shared_ptr<Module> GetModule(Core::System& system) {
     auto hid = system.ServiceManager().GetService<Service::HID::Module::Interface>("hid:USER");
     if (!hid)