Make EventActor.run (and its subclasses) more efficient

[rocco8773]

When a Motor instance was initialized it was executing _configure_before_run() up to 8 times. If the motor is not reachable, this causes a long delay before control is given back to the user. This is then compounded when a run configuration has multiple motors.

To mitigate this behavior, EventActor.run is updated with a force_run keyword argument. This keyword is not explicitly used by EventActor.run but is intended for EventActor sub-classes to utilized. By default force_run is True, which means whenever .run() is executed it will try to fully run or restart the actor. By setting force_run to False (which is done during the __init__ of sub-classes) the actor will can respect certain designed flags to abort a run or restart. For example, the Motor actor will NOT try to restart (or run) when Motor.connected is False and force_run is False.

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What has changed?

• Keyword argument force_run (Default: True) is added to EventActor.run.
• force_run is set False in EventActor.__init__.
• Motor.run is updated to respect the force_run keyword, and NOT run if Motor.connected is False when force_run=False.
• force_run is set False in Motor.__init__.
• Motor._configure_before_run() is immediately returned if not connected after attempting self.connect().
• Axis.run is updated to respect the force_run keyword. Axis itself does NOT have a flag to abort running / restarting.
• force_run is set False in Axis.__init__.
• Motor spawning is moved out of Axis.__init__ and into Axis._configure_before_run so the motor actor is NOT spawned multiple times during instantiation.
• Drive.run is updated to respect the force_run keyword. Drive itself does NOT have a flag to abort running / restarting.
• force_run is set False in Drive.__init__.
• MotionGroup.run is updated to respect the force_run keyword. MotionGroup itself does NOT have a flag to abort running / restarting.
• force_run is set False in MotionGroup.__init__.
• RunManager.run is updated to respect the force_run keyword. RunManager itself does NOT have a flag to abort running / restarting.
• force_run is set False in RunManager.__init__.
• RunManager.run removed the if-clause that prevent a terminated MotionGroup from being restarted.