wl: clean up unit tests
wl: the library fully compiles with all functions written
fixed references to handler array, wireless_receive compiles now
fixed handler array in wireless.c
Updated basic receive function and wrote handler dispatch function. The latter doesn't compile, but most of this directory doesn't.
wl updates: compile issues; now finished (for now)
wl updates: compile issues
Added wrappers to wireless_send.c. Need double checking.
wireless: software retransmit done. serial functions moved to xbee.c
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