Karuna Grewal authored Mar 18, 2018 and Robert Roth committed Mar 21, 2018

* five-or-more-app.c : Here all  the callbacks to the application are connected,
  followed by the general setting related to the application like background
  color etc. are moved to this file

* game-area.c: Drawing area related code ,say, binding signals to callbacks,
  or rendering the graphics, controlling the animation are handled here.

* balls-preview.c: This has the necessary functions for previewing.

Getters are used to access the static variables used across the appliaction
which weren't currently required since all the code was mash-up into
a single file.

https://bugzilla.gnome.org/show_bug.cgi?id=794273