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

manual/plugins/oscilloscope.tex

@@ -14,7 +14,7 @@ to user input and music may start to skip.
     \opt{IRIVER_H100_PAD,IRIVER_H300_PAD,IAUDIO_X5_PAD,SANSA_E200_PAD%
       ,SANSA_FUZE_PAD,SANSA_C200_PAD,SANSA_CLIP_PAD,GIGABEAT_PAD,MROBE100_PAD%
       ,SANSA_FUZEPLUS_PAD}{\ButtonSelect}
-    \opt{IPOD_4G_PAD,IPOD_3G_PAD}{\ButtonSelect+\ButtonPlay}
+    \opt{IPOD_4G_PAD,IPOD_3G_PAD}{Long \ButtonSelect}
     \opt{IRIVER_H10_PAD}{\ButtonRew}
     \opt{GIGABEAT_S_PAD}{\ButtonPrev}
     \opt{COWON_D2_PAD}{\TouchTopMiddle}
@@ -92,7 +92,7 @@ to user input and music may start to skip.
        \opt{HAVEREMOTEKEYMAP}{& }
     & Increase / decrease speed\\
     \opt{IRIVER_H100_PAD,IRIVER_H300_PAD}{\ButtonOff}
-    \opt{IPOD_4G_PAD,IPOD_3G_PAD}{\ButtonSelect+\ButtonMenu}
+    \opt{IPOD_4G_PAD,IPOD_3G_PAD}{\ButtonMenu}
     \opt{IAUDIO_X5_PAD,IRIVER_H10_PAD,SANSA_E200_PAD,SANSA_C200_PAD,SANSA_CLIP_PAD%
         ,GIGABEAT_PAD,MROBE100_PAD,COWON_D2_PAD,SANSA_FUZEPLUS_PAD,XDUOO_X3_PAD}
         {\ButtonPower}