add statistics database and statistics activity to prefs
new gears icon for custom game button
finish: show statistics button in game finish activity
res: trivial fixup
statistics: menu button to clear highscores
stats: record flags in db (e.g. FLAG_IS_PERFECT)
statistics: improved statistics
stats: style updates for borderless button
stats: don't show "reset" in actionBar, it's too dangerous
game: fix racecondition when playing sounds while screen is rotated
stats: show good games and perfect games, remove redundant middle column
statistics: some translation updates
stats: use localized labels for statistics
stats: spinner for game mode added
stats: make statistics value small font
stats: use ActionBar navigation spinner for gamemode on API>=11
preferences: more ActionBar tweaks: icon / up navigation
stats: disable 3rd and 4th place in 2 player modes