Support for loops

[ZdenekM]

• User-defined function can be passed as a parameter to the “for_loop” action (this can be probably made in a generic way, not just for the purpose of cycles).
• Loop itself is action calling given function, with provided parameters.
• Depends on #430.

The code will approximately be like:

def function_1(obj: Generic, idx: int, *, an: Optional[str] = None) -> None:
    obj.hooray(idx, an="action_name_2")

def main():
    ...
    obj.nop()  # just to show that it is there
    ...
    cycles.for_loop(function_1, 0, 10, 1, {"action_name": "a1_for_body", "obj": obj}, an="a1_for")

class Cycles(Generic):

    def for_loop(start: float = 0, stop: float = 10, step: float = 1, loop_body: Callable, loop_body_params: List[ActionParameter], *, an: Optional[str] = None) -> None:
        params_dict = loop_body_params_to_dict(loop_body_params)
        for idx in range(start, stop, step):
            params_dict["idx"] = idx
            loop_body(**params_dict)

Current state: prepared data structures, no support at all.