Initial commit

SPECS.md

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+- Initialize 2 identical large buffer at initialization (default 200MB each, configurable as cli argument) to use as sample buffer for the rest of the application
+- Uses `deps/plotter` for plotting
+- Uses `deps/udpsclient/udps_client.h` to connect to one stream source
+- the application should be composed of:
+  1. main toolbar that contain:
+     - time window selection
+     - plot layout selection
+     - pause/resume button
+     - enable/disable trigger mode
+     - show/hide and reset cursors [horizontal and or vertical]
+  2. when in trigger mode a collapsable right panel to configure trigger logic:
+     - select signal to use as trigger
+     - select edge detection type (rising, falling, both)
+     - select trigger level
+     - select pre trigger window size (in %)
+     - select trigger hold off time (default 10ms)
+     - select trigger mode [normal], [single]
+     - arm/disarm trigger button
+  3. a collapsable signal panel:
+     - list with all available signals
+     - enable/disable signal to acquire
+     - calibrate signal: popup to select offset and gain for signal
+     - drag and drop signal on plot to start plotting it
+     - button to show signal info in a popup (unit, range, rate, type, quantisation etc)
+  4. main view with plot:
+     - multiples plots depending from selected layout
+     - each plot have it x-axis sync
+     - each plot can have y-axis with [right click menu]:
+       1. auto scale (default)
+       2. fixed range (user definable)
+     - each plot can show one or more signals
+- signal acqusition:
+  - the memory buffer should be split in N+1 (where N is the number of enabled signals) and +1 is for the shared time base
+  - only if the time window \* signal sample rate is greater than size of signal buffer decimate input signal
+  - the buffer should be used as circular buffer
+  - the time should be computed from the time associated with the signal (not from the client but from the streamed data)
+  - in trigger mode data visualisation should not be refreshed till next event, that's why 2 identical buffer, one is the currently
+    viewed event, the other used to acquire live data for next event