Add basic common_ui background gfx functions (#415)

* Add basic common_ui background gfx functions

* clang format

* document common_ui.h

* Remove unused tonc header

* Fix header guard name convention

* more header cleanup

* claaaaanggggg format

source/game.c

@@ -11,6 +11,7 @@
 #include "blind.h"
 #include "button.h"
 #include "card.h"
+#include "game/common_ui.h"
 #include "graphic_utils.h"
 #include "hand_analysis.h"
 #include "joker.h"
@@ -235,7 +236,6 @@ static void game_round_end_display_cashout(void);
 static void game_round_end_dismiss_round_end_panel(void);
 
 static void sort_cards(void);
-static void change_background(enum BackgroundId id);
 static void display_temp_score(u32 value);
 static void display_score(u32 value);
 static void check_flaming_score(void);
@@ -1424,7 +1424,7 @@ static inline void reset_top_left_panel_bottom_row()
     main_bg_se_copy_rect(TOP_LEFT_PANEL_BOTTOM_ROW_RESET_RECT, top_left_panel_bottom_row_pos);
 }
 
-static void change_background(enum BackgroundId id)
+void change_background_legacy(enum BackgroundId id)
 {
     if (background == id)
     {

source/game/common_ui.c

@@ -0,0 +1,22 @@
+#include "game/common_ui.h"
+
+#include "game.h"
+
+typedef void (*BackgroundRenderCallback)(void);
+
+// Map to fill in for refactor
+BackgroundRenderCallback bgCallbacks[] =
+{
+    [BG_NONE] = NULL,
+    [BG_CARD_SELECTING] = NULL,
+    [BG_CARD_PLAYING] = NULL,
+    [BG_ROUND_END] = NULL,
+    [BG_SHOP] = NULL,
+    [BG_BLIND_SELECT] = NULL,
+    [BG_MAIN_MENU] = NULL,
+};
+
+void change_background(enum BackgroundId id)
+{
+    change_background_legacy(id);
+}