UI: save and load table/tournament settings to file

[JayDi85]

New table/tournament dialog must have button to save and load game settings. It's already have "load last configuration" buttons but it's a different approach.

TODO:

• make game settings config format (as example: json);
• file format must be compatible between table/tournament modes (e.g. you can load table config for tournament dialog and setup missing values);
• configs can contains small number of settings or other data (as example: image name and description for server side competitive/event);
• add buttons to save and load configs (table + tournament dialogs);
• add sample folder with standard configs for popular game and modes (see sample deck example).

P.S. #446

[Ebola16]

The current automatically saved settings doesn't store player names, skill level, or deck selection properly. This would be a nice feature to have!

Before match:

After match: