Created settings view

Created the settings view. This will allow people to change the
background image of the application and whatever settings we’ll have in
the future
Fixed issue #9

Added check for if AI is on
Added Setttings.qml
Settings button menu button shows settings view
menusOpen for keeping track of visible menus

Fixed bug where aiMove() wasn’t being called

Deprecated isVisible, replaced with menusOpen. menusOpen keeps track of
how many menus are open. When a view is visible ++, when it’s not —.
This will allow for stones to only be placed on the board if menusOpen
=== 0