This callback is useful to broadcast the last print line sent in the form of
the parsed gcoder.Line object. We can then augment the gcoder.Line to do
awesome stuff, such as updating the print status in the 3D viewer.

This commit introduces a use3dview flag, which will be made as an option as
soon as we get a better options GUI.

Several small modifications were required, such as providing build dimensions,
adding some flags, translating numpy arrays into pyglet VBOs and using the
right pyglet GL API function names.

OS X adds this "process serial number" argument automatically when launching an
App or similar situations. We don't care about this argument and drop it before
parsing the args using argparse.

Modify regexps and remove ; filtering

When getting rid of the gcode line number (N**), we were not switching command
string to uppercase.

This might speed up Pronterface while printing.
Indeed, as we keep adding items we keep expanding the list and Python has to
move it all the time.

deque is much better fitted than a simple Python list
Indeed, a standard Python list is stored as an array, and has to be reallocated
all the time, while a deque has very fast operation on both ends, and the fixed
size mode will automatically drop first element when pushing to a full deque.
Also it was crazy to store the whole log. Storing 10000 log lines seems decent
and shouldn't take way too much space (less than 512KB based on a quick
estimation).
This might fix #292 and #353.

This change is free as I already changed this string before pushing :)

This also matters as those actual layers are what we will use for ETA

This change needs testing : M114 is unbuffered, and thus might break lookahead
for Marlin and results in laggy jogging. We need to see how bad this is and
find some smart way to do it (like to send the M114 only when the user stopped
clicking everywhere, by using some timer callbacks).