The module settings are now split between three tabs,
which looks better overall and a little less overloaded.
Additionaly, some new settings which were already present
for the config have been exposed (thumbnails, max button
width).
Finally, some settings have been further refined for
customization (button styles, which were previously
hardcoded -Clssic, Optimal, For transparency- can
now be precisely configured.
Signed-off-by: Mavridis Philippe <mavridisf@gmail.com>