RFPowerMeter 1.26

-Updated to v1.2.6 from http://www.expertrc.com/power-meter/power26/
-Replaced leonardo (ATmega32u4) with Sparkfun16 board definition to support latest PIO build chain
-Workaround for PIO5 LDF compatibility problem with Adafruit_GFX library

RFPowerMeter 1.25

Initial commit of v1.25

RFPowerMeter 1.21

Initial commit of v1.21