Reowrked many aspects. Added SDM at the same time as HRM.
Made str grabbing from PM consistent.
Some extra debug code.
Took out some debug code.
Fix timing of display.
Added in H/W uart -- seems to work for estup of channels but is not getting broadcast packets.
 Moved state counter into the ANT_Channel struct. Allowing overlapping setup.
Working on HW UART.

Seems a bit flaky though...
Added a loop to take all current buffers out of ANT+.
Mainly working but seems to have excessive pauses on some displays.