Add RTK support programs

Compare - Program to locate a common NMEA timestamp message in two log
files and create two new files (a.txt and b.txt) containing all of the
data following the beginning of the common timestamp message.  This
makes comparing two log files much easier since they have a common
starting point.
Example:  ./Compare  20220819_0747_usb.txt  20220819_0747_uart.txt

NMEA_Client - NMEA client program to connect to the RTK NMEA TCP server.
Example:  ./NMEA_Client  192.168.86.225

Split_Messages - Program to verify the checksums and CRCs and count the
various messages in a log file.
Example:  ./Split_Messages  20220819_0747_usb.txt

Author: LeeLeahy2