plugins: Improve usability of iPod keymaps

- Reduce need to press multiple buttons at
the same time to quit a plugin

- Have "Menu" be default way to quit plugins or
to access plugin menu

- Fall back to (Long) "Select" or Long "Menu"
in cases where Menu button isn't available
(e.g. in ImageViewer and many games)

out of scope:
boomshine, lua_scripts, Rockpaint,
Doom, Duke3D, Pacbox, Quake,
Sgt-Puzzles, Wolf3D, XWorld,
Minesweeper, Pixel Painter, Spacerocks

Change-Id: I6d4dc7174695fe4b8ee9cbaccb21bdbfe6af5c48

apps/plugins/clock/clock.c

@@ -44,13 +44,19 @@ const struct button_mapping* plugin_contexts[]={
 
 #define ACTION_COUNTER_TOGGLE           PLA_SELECT
 #define ACTION_COUNTER_RESET            PLA_SELECT_REPEAT
-#define ACTION_MENU                     PLA_CANCEL
 #define ACTION_MODE_NEXT                PLA_RIGHT
 #define ACTION_MODE_NEXT_REPEAT         PLA_RIGHT_REPEAT
 #define ACTION_MODE_PREV                PLA_LEFT
 #define ACTION_MODE_PREV_REPEAT         PLA_LEFT_REPEAT
+#if (CONFIG_KEYPAD == IPOD_1G2G_PAD) \
+    || (CONFIG_KEYPAD == IPOD_3G_PAD) \
+    || (CONFIG_KEYPAD == IPOD_4G_PAD)
+#define ACTION_MENU                     PLA_UP
+#else
+#define ACTION_MENU                     PLA_CANCEL
 #define ACTION_SKIN_NEXT                PLA_UP
 #define ACTION_SKIN_NEXT_REPEAT         PLA_UP_REPEAT
+#endif
 #define ACTION_SKIN_PREV                PLA_DOWN
 #define ACTION_SKIN_PREV_REPEAT         PLA_DOWN_REPEAT
 
@@ -165,10 +171,12 @@ enum plugin_status plugin_start(const void* parameter){
             case ACTION_SKIN_PREV:
                 clock_settings_skin_next(&clock_settings);
                 break;
+#if defined(ACTION_SKIN_NEXT) && defined(ACTION_SKIN_NEXT_REPEAT)
             case ACTION_SKIN_NEXT_REPEAT:
             case ACTION_SKIN_NEXT:
                 clock_settings_skin_previous(&clock_settings);
                 break;
+#endif
             case ACTION_MENU:
                 clock_draw_restore_colors();
                 exit_clock=main_menu();