force_move: Implement CLEAR for SET_KINEMATIC_POSITION (#6262)

`CLEAR` clears the homing status (resets the axis limits) without turning off
the motors. This is particularly useful when implementing safe Z homing in
`[homing_override]` on printers with multiple independent Z steppers (where
`FORCE_MOVE` can't be used).

Signed-off-by: Dennis Marttinen <twelho@welho.tech>

klippy/kinematics/rotary_delta.py

@@ -88,6 +88,11 @@ class RotaryDeltaKinematics:
         self.limit_xy2 = -1.
         if tuple(homing_axes) == (0, 1, 2):
             self.need_home = False
+    def clear_homing_state(self, axes):
+        # Clearing homing state for each axis individually is not implemented
+        if 0 in axes or 1 in axes or 2 in axes:
+            self.limit_xy2 = -1
+            self.need_home = True
     def home(self, homing_state):
         # All axes are homed simultaneously
         homing_state.set_axes([0, 1, 2])
@@ -97,8 +102,7 @@ class RotaryDeltaKinematics:
         forcepos[2] = -1.
         homing_state.home_rails(self.rails, forcepos, self.home_position)
     def _motor_off(self, print_time):
-        self.limit_xy2 = -1.
-        self.need_home = True
+        self.clear_homing_state((0, 1, 2))
     def check_move(self, move):
         end_pos = move.end_pos
         end_xy2 = end_pos[0]**2 + end_pos[1]**2