FS#9281 Rename of splash functions.

* Remove gui_splash()
* Rename gui_syncsplash() to splashf() and remove its voice 
capabilities.
* Rename the internal splash() to splash_internal() and introduce an 
externally visible splash() that handles simple splashing  without 
printf functionality e.g. splash(HZ, ID2P(LANG_FOO)); or splash(HZ, 
"foo"); if a LANG_* id is passed it will be voiced.
* Adjust all places that called gui_syncsplash() to use the correct 
variant from above.
* Export both new functions to plugins and adjust places calling 
rb->splash() to use the correct variant so that we now have naming 
consistency between the core and plugins.
* Fix one latent bug that would cause my sim to crash with the above 
changes and correct P2STR and P2ID macros, thanks to pondlife.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@18282 a1c6a512-1295-4272-9138-f99709370657

apps/plugins/mpegplayer/disk_buf.c

@@ -151,7 +151,7 @@ static inline void disk_buf_buffer(void)
             wm : AVERAGE(disk_buf.low_wm, wm, 16);
 
 #if 0
-        rb->splash(0, "*%10ld %10ld", disk_buf.low_wm,
+        rb->splashf(0, "*%10ld %10ld", disk_buf.low_wm,
                    disk_buf.win_right - sw.right);
 #endif