Normalize game architecture

resources/ui/images/game_win.svg

resources/ui/images/placeholder.svg

resources/ui/skins/default/button_mark_mine_off.svg

resources/ui/skins/default/button_mark_mine_on.svg

resources/ui/skins/default/empty.svg

resources/ui/skins/default/indicator_report_off.svg

resources/ui/skins/default/indicator_report_on.svg

resources/ui/skins/default/indicator_walk_off.svg

resources/ui/skins/default/indicator_walk_on.svg

resources/ui/skins/default/tile_0.svg

resources/ui/skins/default/tile_1.svg

resources/ui/skins/default/tile_2.svg

resources/ui/skins/default/tile_3.svg

resources/ui/skins/default/tile_4.svg

resources/ui/skins/default/tile_5.svg

resources/ui/skins/default/tile_6.svg

resources/ui/skins/default/tile_7.svg

resources/ui/skins/default/tile_8.svg

resources/ui/skins/default/tile_flag.svg

resources/ui/skins/default/tile_flag_ko.svg