Added

Add option to display number in other number systems as the usual decimal system. Enables using
number systems with a base of 2, 4, 8, 10 and 16. The cage text now spans over the hole cage if
needed. Furthermore, the cage text got an adaptive size. When playing with huge numbers like the
Fibonacci sequence, there is a good chance that not all numbers are readable on a classic phone
screen. (idea from ashkitten)
Add separate tab containing options regarding to numbers in new game screen.
Add badges to tabs in new game screen indicating if the tab contains options which were moved from
the default options.
Add confirmation dialog when resetting statistics.

Changed

Rework light theme to use the colors of Gauguin more directly and enhance readability.
Optimize Fast Finishing Mode (ideas from bschwehn):
- Only activate it if there are cells with a single pencil mark left.
- Exit the mode as soon as there is no cell with a single pencil mark.

When revealing a cell or cage, the pencil marks get updated, too. (reported by mccartney)
Avoids breaking the streak if a new game has not been played yet. (reported by mccartney)
When playing with a tablet sized device in landscape mode, the app bar did not use the full width of the screen.