button.h cleanup, with the future "button action" thing in mind:

1) Main unit's button defines are from the LSB to the MSB (currently bits 0-9, 0x00000200), remote ones are from the 20th bit (0x00100000) downards to 10th(0x00000400);
2) Removed the BUTTON_REMOTE modifier, replaced with a bitmask of all of the remote buttons (where applicable, otherwise with 0), added a complementary BUTTON_MAIN bitmask;
3) Moved button modifiers:
  - BUTTON_REPEAT: to bit 26 (0x04000000)
  - BUTTON_REL: to bit 25 (0x02000000)
There are at least 4 bits free on all targets now: 21-24.
If we really need more free bits, it's possible to SHR remote buttons 1 bit more (freeing bit 20 too), and to change the SYS_EVENT bit with a bitmask (+2 bits).
4) Bumped up the min. plugin ver. (and sorted the plugin api struct), because the binary plugins with key input won't understand the new values


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@9149 a1c6a512-1295-4272-9138-f99709370657

apps/plugin.c

@@ -179,7 +179,7 @@ static const struct plugin_api rockbox_api = {
     button_get_w_tmo,
     button_status,
     button_clear_queue,
-#if CONFIG_KEYPAD == IRIVER_H100_PAD
+#ifdef HAS_BUTTON_HOLD 
     button_hold,
 #endif
 
@@ -357,6 +357,7 @@ static const struct plugin_api rockbox_api = {
     menu_draw,
     menu_insert,
     menu_set_cursor,
+    set_option,
 
     /* power */
     battery_level,
@@ -411,13 +412,6 @@ static const struct plugin_api rockbox_api = {
     /* new stuff at the end, sort into place next time
        the API gets incompatible */
 
-#if CONFIG_KEYPAD == IRIVER_H300_PAD || CONFIG_KEYPAD == IPOD_4G_PAD
-    /* NOTE: This is already in the plugin api for the H100 - but we put it
-       at the end for other targets to keep the plugin api compatible */
-    button_hold,
-#endif
-    /* options */
-    set_option,
 };
 
 int plugin_load(const char* plugin, void* parameter)