added "How to Play" dialog

 - a dialog show how to play OchiMikan
added: score list feature

 - An experimental score list feature has been added
added: experimental score registration functionality

 - A score and a name now can be registered after the game ended.
added: highlight of the last rank

 - Score of the last game is highlighted
 - A privacy notice has been added
added RecordBase

 - RecordBase simplifies score requests and registration