Merge 6688_feature to main

Add AUTOSAVE to the IOC to store state of the following PVs:

• (IOC_PREFIX):(CTRL_PREFIX):SEL_FB_AUTO_OFF
• (IOC_PREFIX):(CTRL_PREFIX):TIMER_PERIOD
• (IOC_PREFIX):(CTRL_PREFIX):CURR_SUM_THRESH
• (IOC_PREFIX):(CTRL_PREFIX):WD_THRESH
• (IOC_PREFIX):(PID_PREFIX).KP
• (IOC_PREFIX):(PID_PREFIX).KI
• (IOC_PREFIX):(PID_PREFIX).KD