YH8xx,YH9xx: Keymap improvement

The main "innovation" in this patch are two "virtual buttons"
for the record switch on YH92x targets. When the switch state
changes, a single BUTTON_REC_SW_ON or .._OFF button event will
be generated. Thus keymap code can react on switching, but
not on the actual state of the switch.

Wherever sensible, the following user scheme is applied:
- use PLAY as confirm button
- use REW button or Long REW to exit
- use REC (YH820) or FFWD (YH92X) as modifier key for button combos

Change-Id: Ic8d1db9cc6869daed8dda98990dfdf7f6fd5d5a1

manual/plugins/chopper.tex

@@ -8,7 +8,7 @@
     \begin{btnmap}
       \opt{RECORDER_PAD}{\ButtonPlay}%
       \opt{ONDIO_PAD}{\ButtonUp{} / \ButtonMenu}
-      \opt{IRIVER_H10_PAD,SAMSUNG_YH92X_PAD,SAMSUNG_YH820_PAD}{\ButtonRight}
+      \opt{IRIVER_H10_PAD}{\ButtonRight}
       \opt{IPOD_4G_PAD,IPOD_3G_PAD,SANSA_E200_PAD,SANSA_C200_PAD,SANSA_CLIP_PAD,MROBE100_PAD%
         ,GIGABEAT_PAD,SANSA_FUZE_PAD,SANSA_FUZEPLUS_PAD}
         {\ButtonSelect}
@@ -16,6 +16,7 @@
       \opt{GIGABEAT_S_PAD}{\ButtonSelect{} / \ButtonMenu}
       \opt{COWON_D2_PAD}{\ButtonPlus{} / \TouchBottomLeft}
       \opt{PBELL_VIBE500_PAD}{\ButtonPlay{} / \ButtonUp}
+      \opt{SAMSUNG_YH92X_PAD,SAMSUNG_YH820_PAD}{\ButtonRight{} / \ButtonUp}
       \opt{MPIO_HD300_PAD}{\ButtonEnter}
        \opt{HAVEREMOTEKEYMAP}{& }
       & Make chopper fly\\