Add PTZ presets and other optimizations. (#389)

* add PTZperset function

* Display asix to OSD

* delete source

* add motor_PTZ function

* Motor adds f parameter (calibrate) and is compatible with the new version of DAFANG.

* calibrate,compatible newer models.

* OSD set POSY 0

* Wait for the previous command to run before running

* Disable Statements That Cause MQTT Alerts

* fix mqtt

* Fixed issue where multi-tasking motor was not moved to the specified position and was interrupted

* Add limit on the number of snapshots

* Add OSD Display AXIS

* Repair Limit Snapshot Number Does Not Take Effect..

* Enable log option

* Keep the original time style

* Keep default osd settings

* Modify loger as a logger

* Api.cgi is not in use

* Clear the old DAFANG calibration failure code.

New DAFANG Run the `/system/sdcard/bin/motor -d f` command to calibrate.

Old and generous Please run `/system/sdcard/bin/motor -d h && /system/sdcard/bin/motor -d v` command to calibrate

* Change the zero point of the motor calibration coordinate to the middle point of the motor.

* Fix the coordinate display of the new motor command.

* fix typo

firmware_mod/scripts/detectionOn.sh

@@ -16,6 +16,10 @@ if [ "$save_snapshot" = true ] ; then
 	if [ ! -d "$save_dir" ]; then
 		mkdir -p $save_dir
 	fi
+	# Limit the number of snapshots
+	if [[ $(ls $save_dir | wc -l) -ge $max_snapshots ]]; then
+		rm -f "$save_dir/$(ls -l $save_dir | awk 'NR==2{print $9}')"
+	fi
 	/system/sdcard/bin/getimage > $save_dir/$filename &
 fi