idle_timeout: Move timeout handling from toolhead.py to new extras module

Move the "motor_off_timeout" tracking to a new module in the extras/
directory.  This makes it easier to customize the idle timeout
behavior.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

config/example-extras.cfg

@@ -165,6 +165,17 @@
 #   default is 120.
 
 
+# Idle timeout. An idle timeout is automatically enabled - add an
+# explicit idle_timeout config section to change the default settings.
+#[idle_timeout]
+#gcode:
+#   A list of G-Code commands (one per line) to execute on an idle
+#   timeout. The default is to run "M84".
+#timeout: 600
+#   Idle time (in seconds) to wait before running the above G-Code
+#   commands. The default is 600 seconds.
+
+
 # Multi-stepper axes. On a cartesian style printer, the stepper
 # controlling a given axis may have additional config blocks defining
 # steppers that should be stepped in concert with the primary

config/example.cfg

@@ -293,9 +293,6 @@ max_z_accel: 30
 #   mm/s^2) of movement along the z axis. It limits the acceleration
 #   of the z stepper motor on cartesian printers. The default is to
 #   use max_accel for max_z_accel.
-#motor_off_time: 600
-#   Time (in seconds) of idle time before the printer will try to
-#   disable active motors. The default is 600 seconds.
 #square_corner_velocity: 5.0
 #   The maximum velocity (in mm/s) that the toolhead may travel a 90
 #   degree corner at. A non-zero value can reduce changes in extruder

config/kit-voron2-2018.cfg

@@ -216,5 +216,7 @@ max_velocity: 500
 max_accel: 3000
 max_z_velocity: 100
 max_z_accel: 50
+
+[idle_timeout]
 # high motor off time so I don't have to relevel gantry often
-motor_off_time: 6000
+timeout: 6000

config/printer-anycubic-kossel-2016.cfg

@@ -71,9 +71,11 @@ kinematics: delta
 max_velocity: 500
 max_accel: 3000
 max_z_velocity: 150
-motor_off_time: 360
 delta_radius: 99.8
 
+[idle_timeout]
+timeout: 360
+
 #[delta_calibrate]
 #radius: 50
 #manual_probe:

config/printer-anycubic-kossel-plus-2017.cfg

@@ -80,11 +80,13 @@ kinematics: delta
 max_velocity: 200
 max_accel: 3000
 max_z_velocity: 200
-motor_off_time: 360
 delta_radius: 115
 # if you want to DELTA_CALIBRATE you may need that
 #minimum_z_position: -5
 
+[idle_timeout]
+timeout: 360
+
 #[delta_calibrate]
 #radius: 115
 #manual_probe: