Reimplemented pick system with utf-8 support

My first iteration of this app I didn't realize Shoes actually [supports
"UTF-8 Everywhere"](http://shoesrb.com/manual/Rules.html)

So now I've gone back and removed all those silly japanese hiragana
images and implemented this again using the same hash-table as
`mojibake.rb`. Maybe someone could refactor the common functionality
between the two now, since they're not dependent on any user-interface.

This also implements Game.pick_options which extracts the font-type and
font-size used to render the pick on the app ui.
Delete Mojibake#check_guess, we can just move this code to #run

This will reduce number of lines, and make it similar to `mojibake.rb`

Also deleted Game.render_pick and Game.set_random_pick, which were also
moved to Mojibake#run. Moving these to Mojibake makes it easier to
explain, and they don't need to be hidden from user. Assuming that the
user won't need to read Game implementation.

This change also moves Game.pick_options source location to alphabetize
the methods in `helpers/game.rb`