py: grand st3m unification

Commandeering @iggy 's stemming_merge branch and continuing his work.

This is now at the point where we fully moved st4m back into st3m, and we have the ability to launch applications from the new 'sun' menu.

I had to undo some changes that I hope to restore soon:

1. Captouch-based scroll. It still lives in comments.
2. The old flower-menu but rebuilt on top of the new menu/scroll framework.

But this at least brings us one step closer to production code, and unblocks a bunch of other stuff.

python_payload/apps/flow3r/__init__.py

-import math
-
-from st3m import logging, event, ui
-
-log = logging.Log(__name__, level=logging.INFO)
-log.info(f"running {__name__}")
-
-from st3m.application import Application
-from . import menu_main
-
-
-class myApp(Application):
-    def __init__(self, *args, **kwargs):
-        super().__init__(*args, **kwargs)
-        self.event_input_overlay = event.Event(
-            name="show input overlay",
-            group_id="input-overlay",
-            # condition=lambda d: d['type'] in ["captouch","button"],
-            condition=lambda d: d["type"] in ["captouch"] and d["value"] == 1,
-            action=self.update_input_data,
-            enabled=False,
-        )
-        self.ui_input = ui.Viewport()
-        for i in range(2):
-            self.ui_input.add(ui.IconLabel(label="", size=25))
-        self.set_input_overlay(False)
-
-    def on_init(self):
-        self.menu = menu_main.get_menu(self)
-
-    def on_foreground(self):
-        self.menu.start()
-
-    def update_input_data(self, data):
-        # label = self.ui_input.children[2]
-        phi = data["angle"] / 600
-        # deg = data["angle"]/(2*3.14)*180
-
-        idx = data["index"]
-        r = -data["radius"] / 600
-
-        angle = math.atan2(r, phi)
-        deg = int(angle / math.pi * 180)
-        (x, y) = (int(r), int(phi))  # ui.xy_from_polar(r, phi)
-
-        p1 = self.ui_input.children[0]
-        p1.label = f"{idx} {(x,y)}"
-        p1.origin = (x, y)
-
-        p2 = self.ui_input.children[1]
-        p2.label = f"{idx} {deg}"
-        p2.origin = ui.xy_from_polar(110, angle)
-        # my_petal.s = f"{idx}: phi{phi:1} r{r:1}"
-
-    #        label.label = f"{idx}: {int(x)},{int(y)} r{int(r)} phi{int(phi)}"
-    # label.label = f"{idx}: {int(x)},{int(y)} angle{angle:1}"
-
-    def set_input_overlay(self, value):
-        self.event_input_overlay.set_enabled(value)
-        if value:
-            event.the_engine.overlay = self.ui_input
-        else:
-            event.the_engine.overlay = None
-
-    def get_input_overlay(self):
-        return self.event_input_overlay.enabled
-
-
-app = myApp("flow3r", exit_on_menu_enter=False)