Fixed(?) GridView
Added numpad, fixed a bunch of miscellaneous bugs.
Target action pattern works. There’s a warning but it PROBABLY isn’t actually breaking anything. Functionality is almost complete for this stage, except that we can’t blank out cells and mutable cells have the same font style.
All MVP functionality appears complete except for generating new grids. There is still a warning about a possible memory leak. We know the warning not to actually be an issue, but it still needs to be resolved, although we are not sure how yet.
Changed font color to white for mutable cells.
Added unit tests, modified some minor things stylistically
Merge pull request #2 from JoshPetrack/gridModel

Grid model