Allow 'call' during all betting periods.
Compare hands with same matchCount in Reverse game

This is going to require one more commit, and that's to take away the 0
is high or low rule. It overly complicates things like this, when
currently we have the simple measure of sorting all of the digits
descending and then subtracting the two hands.
0 no longer is high or low, it's just low now.

Now that hands of the same matchCount / type can be compared against
each other, and is done so in a very simple way (sort by digits
descending and subtracted), keeping this rule is just getting in the
way. We'll see how the play testing goes with that.