runtime: white space removal.
controlport: adding a 'toggle' interface for ControlPort.

This is very similar and accessed like a 'set' function only it does not take a parameter; it simply calls a function. Meant to toggle an action, like reseting the performance counters or locking/unlocking the flowgraph.
controlport: allows reset_perf_counters to be called over controlport; gr-perf-monitorx has button to call this.

Also changes the icon of the ControlPort tools to the new one.
grc: new tools menu to execute gr_filter_design
grc: tools menu entry 'more to come'
codec2 library update
Bring codec2 up to the latest version, and add support for all six bit rates.
vocoder: use system libraries for libgsm and codec2, if found
Merge remote-tracking branch 'gnuradio-wg-grc/grc_tools_menu'
cmake and build: fixes for cross-compiling to enable ControlPort with ICE.
digital: pfb_clock_sync throws when no taps are provided (instead of segfaulting).
Merge branch 'maint'
Merge branch 'cmake_oe_fixes'
Merge branch 'ctrlport_trigger'
vocoder: add default mode parameter and updated documentation
Merge branch 'merge-codec2-update'
Corrected codec2 encoder documentation.
documentation - fix example in case anyone gets confused
Merge branch 'maint'
controlport: in gr-perf-monitorx, if all work times returned are 0, avoid a divide-by-zero fault.