[Tutorial] Fix includes broken by upstream IWYU refactor

The master merge replaced several transitive includes with forward
declarations; add back the complete types the tutorial code needs:
CounterState and PlayerEventHandler in tab_game.cpp, DeckList in
visual_deck_editor_widget.cpp, TabDeckEditorVisualTabWidget and
VisualDeckEditorWidget in visual_database_display_widget.cpp.

cockatrice/src/interface/widgets/tabs/tab_game.cpp

@@ -3,9 +3,11 @@
 #include "../../../client/settings/cache_settings.h"
 #include "../../../client/settings/shortcuts_settings.h"
 #include "../../../game/abstract_game.h"
+#include "../../../game/board/counter_state.h"
 #include "../../../game/game_event_handler.h"
 #include "../../../game/game_meta_info.h"
 #include "../../../game/game_state.h"
+#include "../../../game/player/player_event_handler.h"
 #include "../../../game/player/player_info.h"
 #include "../../../game/player/player_manager.h"
 #include "../../../game_graphics/board/abstract_card_item.h"

cockatrice/src/interface/widgets/visual_database_display/visual_database_display_widget.cpp

@@ -14,7 +14,9 @@
 #include "../general/tutorial/tutorial_controller.h"
 #include "../quick_settings/settings_button_widget.h"
 #include "../tabs/visual_deck_editor/tab_deck_editor_visual.h"
+#include "../tabs/visual_deck_editor/tab_deck_editor_visual_tab_widget.h"
 #include "../utility/custom_line_edit.h"
+#include "../visual_deck_editor/visual_deck_editor_widget.h"
 #include "card_database_display_model.h"
 #include "card_database_model.h"
 #include "deck_list_model.h"

cockatrice/src/interface/widgets/visual_deck_editor/visual_deck_editor_widget.cpp

@@ -39,6 +39,7 @@
 #include <QVariant>
 #include <QtGlobal>
 #include <libcockatrice/card/database/card_database_manager.h>
+#include <libcockatrice/deck_list/deck_list.h>
 #include <libcockatrice/models/database/card_database_model.h>
 #include <libcockatrice/models/deck_list/deck_list_model.h>
 #include <libcockatrice/settings/cards_display_settings.h>