Change plot_data.py to command line tool.

plot_data.py is now a command line tool used to plot collected data.

Signed-off-by: Dale Lukas Peterson <hazelnusse@gmail.com>
Plot fixes for plot_data.py.

Update plot_data.py to work with after changes to sampleplotter.py.

Signed-off-by: Dale Lukas Peterson <hazelnusse@gmail.com>
Add 'Steer Angle' plot option to plot_data.py.

Signed-off-by: Dale Lukas Peterson <hazelnusse@gmail.com>
Moved plot_data.py to scripts and fixed path
Removed old plot_data.py file from root of repo.