added "OTA request" flag, reset reason feedback to main app via GPIOR0

preliminary boot image supplied for testing.
see #16 for discussion on remaining quirks

Author: gvdw

hardware/pinoccio/avr/bootloaders/STK500RFR2/release_0.50-prelim/boot_pinoccio.hex

@@ -0,0 +1,287 @@
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