Added option to ignore minimized windows during cycling.

Added CycleIgnoreMinimized configuration option settable on Expert page in WPrefs.
When option is set, switch panel cycling ignores minimized (grayed) windows. They
are still visible and can be selected using left/right arrows or mouse click.

src/WindowMaker.h

@@ -427,6 +427,7 @@ typedef struct WPreferences {
     char single_click;                  /* single click to lauch applications */
     int history_lines;                  /* history of "Run..." dialog */
     char cycle_active_head_only;        /* Cycle only windows on the active head */
+    char cycle_ignore_minimized;        /* Ignore minimized windows when cycling */
 
     RImage *swtileImage;
     RImage *swbackImage[9];