Fixing serial typo in a comment

Modified to add ShowAll/HideAll command
Modified to let ShowInterval and ShowRPM run without ShowAngle
Modified to check that xv_config is not too big for EEPROM
Modified to delete ShowDist/HideDist commands, since that functionality is subsumed by ShowAngle(s)

Doug Hilton - merge ShowAngles command into ShowAngle Command. add ShowInterval and HideInterval command.  Output to CSV format

Doug Hilton.  Added ShowAngles to be able to pick and choose multiple angles.  Improved error reporting.

Contribution from Doug Hilton.  Complete rewrite of data processing from lidar including crc error checking.

Contribution from Doug Hilton.  Complete rewrite of data processing from lidar including crc error checking.

When using ShowAngle, angle values interpreted from data stream instead of just incrementing for valid data in case of packet loss.
Lowered PWM min to work with generic replacement motors.
Added failsafe to shut down the motor when at 100% duty cycle and RPM not within range

Added firmware version to config to enable easy identification of which firmware is loaded
Made use of the F() macro in Serial print statements to reduce memory usage
Enabled LED indication of transmitting data

Add SampleTime to Help menu

fixed typo
added save reply

implement fix for PID to work from EEPROM values - needs testing