#4 modularize toneclient i/o

[Brad H]

toneclient() does not yet handle reading of the cam
frame data yet. When coding this functionality, keep
in mind that in the future that this function might
need to buffer the stream of frames... in case of
network congestion... etc. so I'm proposing that this
function access its local copy of cam frame data
through 2 or more helper functions. by coding it so
all memory accessing goes through these functions, it
will be simlper to upgrade the memory access aspect of
the function in the future.