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/mosaique.c

@@ -37,10 +37,17 @@
 static const struct button_mapping *plugin_contexts[] = { pla_main_ctx };
 
 #define MOSAIQUE_QUIT        PLA_EXIT
-#define MOSAIQUE_QUIT2       PLA_CANCEL
-#define MOSAIQUE_SPEED       PLA_UP
+#define MOSAIQUE_SPEED       PLA_RIGHT
 #define MOSAIQUE_RESTART     PLA_SELECT
 
+#if (CONFIG_KEYPAD == IPOD_1G2G_PAD) \
+    || (CONFIG_KEYPAD == IPOD_3G_PAD) \
+    || (CONFIG_KEYPAD == IPOD_4G_PAD)
+#define MOSAIQUE_QUIT2             PLA_UP
+#else
+#define MOSAIQUE_QUIT2             PLA_CANCEL
+#endif
+
 enum plugin_status plugin_start(const void* parameter)
 {
     int button;