The counter is incremented after each new generation and reset
whenever any cell on the board is toggled. Resizing the board
does not reset the tick count.
Previously, when there were more rows or columns than the BoardWidget
could contain, nothing was displayed. The BoardWidget minimum size is
now set whenever the number of rows or columns changes.
We have a new, improved string type coming up in AK (OOM aware, no null
state), and while it's going to use UTF-8, the name UTF8String is a
mouthful - so let's free up the String name by renaming the existing
class.
Making the old one have an annoying name will hopefully also help with
quick adoption :^)
This is not only easier to comprehend code-wise and avoids some function
overloads, but also makes resizing the board while preserving game state
*a lot* easier. We now no longer have to allocate a new board on every
resize, we just grow/shrink the individual row vectors.
Also fixes a crash when clicking the board widget outside of the drawn
board area.
