plot_utils: Autoscale bar charts

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
python scripts: Reformat tabs to 4-spaces

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
plotter.py: Update html generator

Using bootstrap design now

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>