- fixes in material buttons (still tentative design!)

- cutoff of text in menus and buttons now even better!
- size of pull-up menu buttons is corrected
- pressing at 'menu button' had a delay, fixed

General: the 'outo open' wont become default, it will be removed or
become a user option. I am experimenting with it to get it all OK.
The 'auto open' for secondary levels in pulldowns will remain there

Check the latest state of pull-up menu buttons. for example the mode
selector: you can use such buttons in three ways,

- click on it, it opens and you can select
- click-and-hold-mouse, move, release at item you want to select
- move mouse over button, wait, it opens

The 'auto open' and its time threshold both can be user settings.

source/blender/src/header_sound.c

@@ -187,7 +187,7 @@ void sound_buttons(void)
 	else uiDefIconBut(block, BUT,B_FULL, ICON_FULLSCREEN,	xco+=XIC,0,XIC,YIC, 0, 0, 0, 0, 0, "Makes current window full screen (CTRL+Down arrow)");
 	uiDefIconBut(block, BUT, B_SOUNDHOME, ICON_HOME,	xco+=XIC,0,XIC,YIC, 0, 0, 0, 0, 0, "Zooms window to home view showing all items (HOMEKEY)");
 
-	xco= std_libbuttons(block, xco+40, 0, NULL, B_SOUNDBROWSE, (ID *)G.ssound->sound, 0, &(G.ssound->sndnr), 1, 0, 0, 0, 0);	
+	xco= std_libbuttons(block, xco+40, 0, 0, NULL, B_SOUNDBROWSE, (ID *)G.ssound->sound, 0, &(G.ssound->sndnr), 1, 0, 0, 0, 0);	
 
 	if(G.ssound->sound) {
 		bSound *sound= G.ssound->sound;