Fixed select box feature
Added feature

The Invert tiles button inverts all the states of the cells on screen.
Select Feature Extended

Select feature interacts with Invert feature so that you can invert the
selection or the board depending on if you select something.
Reset feature extended

Interacts with select feature - resets selected area if in select mode,
or else resets everything.
Random tiles feature extended

Interacts with select box feature.
Fixed bug

Bug of selecting subsequent times.
Bug fix

Bug: Can only run boards with equal sides.