1. fix vertical lines to small to be seen: in some cases (e.g. rect waveform in @mock_upstreamer.py) the vertical lines are to thin to be visible (sometime they glitch in and out of existence):
   1. the antialisaing strategy with phosphore effect should be applied with more stregth
   2. the lines should be more tick
   3. the sample points should be bigger
2. ~~relative timing~~ **done**: `--relative-time`; see README and SPECS.md for the measured history cost.
   - in order to avoid problem with time jitter user can decide to go in relative time mode
   - in this mode absolute signal time is only use for export
   - the plot time depends just on signal sample rate and frame number, e.g.:
     - user is acquiring a signal with 1MSps and 100_000 samples per udp frame
     - last frame as number <N> and previous <N-2> in this case a 100_000 indexes must be skipped
     - time is simply: `((<N_frame> - <N_last>) * <n_samples_per_frame> - <sample_index>) / <sample rate>` (or something like that)
3. named configurations: in order to have multiples configurations for the same sources configuration can also have comments
4. optional udp frame storage for debugging of strange behaviours (store last <N>, default = 1000, udp packets binary content on disk for forensic analyss)
5. open exported binary waveforms to view/analyse, in the source selection dialog there should be the option to open exported waveform (maybe a tab with latest opened file and option to open new ones?)
6. imporve right click menu on the plots:
   - use same compact style of main menu
   - add a [remove signal] entry that open a submenu to delete signasl
7. in layout edit mode add the option to drag plot border to resize them
8. add option to automatic save the last <N> triggered acquisitions in a cache folder and let the user replay them
   - a collapsable pane on the left with the list of the last <N> acqusition with duration number of signals etc
   - user select one and immidiatly open it
   - this option would only be available in trigger mode
9. preferences dialog:
   - user can choose evnt cache directory (default <home>/.cache/udpscope/<source>/events/)
   - maximum number of events to cache
   - disable completly the events storage option
   - enable/disable relative time mode
   - interface dark/light/auto color
   - defaults
   - other parameters