Add a main menu scene with Start/Hard Mode/Music options

The game now boots into a menu (Start Game, Hard Mode toggle, Music
toggle) navigated with Up/Down and A/Start, instead of dropping
straight into a match. B returns to the menu from a paused or
game-over state.

source/main.cpp

@@ -57,6 +57,7 @@ void setup() {
 	videoSetMode(MODE_0_2D);
 	videoSetModeSub(MODE_0_2D);
 	
+	vramSetBankA(VRAM_A_MAIN_BG);
 	vramSetBankC(VRAM_C_SUB_BG);
 	vramSetBankD(VRAM_D_SUB_SPRITE);
 	consoleInit(&topScreen, 3,BgType_Text4bpp, BgSize_T_256x256, X_MAX, 0, true, true);
@@ -115,14 +116,16 @@ void setup() {
 }
 void handle_vblank() {
 	frame++;
-	consoleSelect(&topScreen);
-	draw_stats(gameState, internals, audio_is_music_enabled(audioContext), frame);
+	if (gameState.scene == Scene::Playing) {
+		consoleSelect(&topScreen);
+		draw_stats(gameState, internals, audio_is_music_enabled(audioContext), frame);
+	}
 	oamUpdate(&oamSub);
 	//flashy_colors();
 }
 
 void do_tick() {
-	if (!paused) {
+	if (gameState.scene == Scene::Playing && !paused) {
 		ticks++;
 		if (!gameOver){
 			const bool wasGameOver = gameOver;
@@ -211,9 +214,7 @@ int main(void) {
 	irqSet(IRQ_VBLANK, handle_vblank);
 
 	setup();
-	init_game();
-
-	// Start timer for game ticks
+	draw_menu(gameState, renderAssets, audio_is_music_enabled(audioContext));
 
 	InputContext inputContext;
 	inputContext.state = &gameState;
@@ -223,7 +224,7 @@ int main(void) {
 	inputContext.topScreen = &topScreen;
 	inputContext.init_game = init_game;
 
- 
+
 	while(1) {
 		if (!handle_input_frame(inputContext)) {
 			break;