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/Scene.h

@@ -4,6 +4,7 @@
 #define ACTION(X, Y) (name.compare(X) == 0 && type.compare(Y) == 0)
 #define ACTIONONCE(X) ((name.compare(X) == 0 && type.compare("start") == 0 && !actionState[name]))
 #define ACTIONAFTER(X) ((name.compare(X) == 0 && type.compare("end") == 0))
+#define ACTIONPY ((name.size() > 3 && name.compare(name.size() - 3, 3, "_py") == 0))
 
 #include "Common.h"
 //#include "GameEngine.h"
@@ -32,5 +33,8 @@ public:
     bool hasAction(std::string);
     bool hasAction(int);
     std::string action(int);
+    
+    virtual bool registerActionInjected(int, std::string);
+    virtual bool unregisterActionInjected(int, std::string);
 
 };