Some work on router-to-server, peacock update

Peacock handler checks to see if more peacock packets coming. More work
on the intra-router implementation
Added server-->router conversion

No tests yet
Not all values have been defined, since the API hasn't been fully
fleshed out yet.
Added correct delimiters to server-->router

These are wide chars, so some tweaking was needed
Separated server-->router handling for tests

The functionality that doesn't directly talk to the server has been
moved to another file so that it can be tested with server-->router
stubs
Added SPI code from EEPROM tests

Obviously, these functions are not yet ready to do any communication
with the radio module; they will be adapted to do so soon
Added atox test

Currently doesn't pass
atox() passes tests