MARKERS: Re-work markers, so we have a few different options.
             Still needs a little work, but it's almost what we need
             to test the FMComms1 boards.
 MARKERS: Connect load/save profiles to the new marker infrastructure
PROFILES: Save/Load the capture status of the capture window.
ALL: Make CTRL-Q and CTRL-S quit and save
osc.c: Remove warning by initialising the variable.
ALL: save a default profile on quit, and load it on start.      which stops me (and everyone else) from making common changes      on startup.

     The only time this might cause a problem (and still needs to be
     tested, is when you start things, turn it off, swap cards (and
     and therefor which plugins are active).
Merge branch 'multi_plot_osc' of https://github.com/analogdevicesinc/iio-oscilloscope into multi_plot_osc