Tinkering with input

I want to move keyboard input defs to the Python API. I laid the groundwork for it today.

From the JANKFILE:

- working on API endpoint `_registerInputAction`.

it will add "_py" as a suffix to the action string and register it along with other scene actions.

- Adding public Scene methods. These are on the base class with default of return `false`.

`bool Scene::registerActionInjected(int code, std::string name)` and `unregisterActionInjected`

the PythonScene (and other scenes that support injected user input) can override this method, check existing registrations, and return `true` when succeeding.

Also, upgraded to C++20 (g++ `c++2a`), mostly because I want to use map::contains.

src/PythonScene.h

@@ -17,9 +17,13 @@ class PythonScene: public Scene
     void doZoom(sf::Vector2i, int);
     //std::list<Animation*> animations;
     void animate();
+    std::map<std::string, bool> actionInjected;
+    
 public:
     PythonScene(GameEngine*, std::string);
     void update() override final;
     void doAction(std::string, std::string) override final;
     void sRender() override final;
+    bool registerActionInjected(int, std::string) override final;
+    bool unregisterActionInjected(int, std::string) override final;
 };