Remove Trackuino power related files

Once we are on final hardware, I can investigate approaches to minimize
power usage on the LPC1768 but I am going to ignore for now during
prototyping.
Remove AVR/PIC32 pin sources

The mbed SDK has its own abstraction for pins that trackMYmbed will use
instead.
Update config.h to match trackMYmbed feature diffs
Rename trackuino dir to firmware
Initial port of APRS and AX.25 module

Code builds but hasn't been properly tested yet.