Added Keil projects to rx/tx apps. Paths to SDK files are absolute.
Added new app "duplex-button-led". Program same hex file to both devices, and press buttons to light remote leds.
New files for managing buttons.
Fixes for packet_timer module to make it work for me.
Fixes for duplex support (TX -> RX instead of TX -> IDLE)
pragma for the sake of Keil compiler.
Button events added to event enum. These should get their own event handler eventually.
Bigger queue sizes for robustness
To prevent duplicate PACKET_LOST events.
Fixes to make the radio work