Release 1.6.1 - 21.12.2022

BUG FIXES
- Network Outputs: fix header exported info node content.


Release 1.6.0 - 20.12.2022

INCOMPATIBLE CHANGES
- Network Output modules: network streams now start with an IOHeader at their front.
  Clients must update their parsing code to account for this.
- Visualizer: replaced the old SFML embedded visualizer with a new one based on the
  more modern SDL2 library. Only shows frames on screen, use other modules to convert
  your data into a dv::Frame, such as Accumulator or Event Visualizer.

NEW FEATURES
- Event Visualizer: converts events into frames without accumulation, just straight
  visualization as in the DV GUI.

BUG FIXES
- dv::Frame: update documentation on timestamps.
- FrameHistogram: fix generation of histogram.
- CMake: update to current best practices.