Tud-sumo

Additions
- Added `MultiPlotter` class to plot data from multiple simulations.
- Added `MultiPlotter.plot_[vehicle|detector|edge]_data()` for plotting tracked edge data.
- Added `MultiPlotter.plot_throughput()`.
- Added `Plotter.plot_edge_data()`.
- Added `Simulation.get_interval_vehicle_data()` function to get network-wide vehicle data over a specific time range.
- Added `Simulation.curr_time` attribute.

Changes & Improvements
- Changed to allow for route/additional/GUI files not linked in the SUMO configuration file.
- Some visual improvements to progress bar.
- Text summaries are no longer printed if they are saved to a file.
- Fixed images for pip distribution description.

- Updated for migration to DAIMoNDLab repository.
- Added `Simulation.set_m_phases()` to set traffic phases by movement.
- Added Google-style standardised docstrings to all functions.
- Added `sumo_home` parameter to `Simulation.start()` to set the `$SUMO_HOME` environment variable.