Add shortcut to start mate-control-center

Some laptops have a setting hotkey. This is bound by default to
XF86Tools. Add shortcut to start mate-control-center to support it.

Signed-off-by: Zhang Xianwei <zhang.xianwei8@zte.com.cn>

data/org.mate.SettingsDaemon.plugins.media-keys.gschema.xml.in

@@ -70,6 +70,11 @@
       <summary>Launch email client</summary>
       <description>Binding to launch the email client.</description>
     </key>
+    <key name="control-center" type="s">
+      <default>'XF86Tools'</default>
+      <summary>Launch settings</summary>
+      <description>Binding to launch MATE settings.</description>
+    </key>
     <key name="screensaver" type="s">
       <default>'&lt;Control&gt;&lt;Alt&gt;l'</default>
       <summary>Lock screen</summary>

plugins/media-keys/acme.h

@@ -39,6 +39,7 @@ enum {
         CALCULATOR_KEY,
         SEARCH_KEY,
         EMAIL_KEY,
+        CONTROL_CENTER_KEY,
         SCREENSAVER_KEY,
         HELP_KEY,
         WWW_KEY,
@@ -77,6 +78,7 @@ static struct {
         { CALCULATOR_KEY, "calculator", NULL, NULL },
         { SEARCH_KEY, "search", NULL, NULL },
         { EMAIL_KEY, "email", NULL, NULL },
+        { CONTROL_CENTER_KEY, "control-center", NULL, NULL },
         { SCREENSAVER_KEY, "screensaver", NULL, NULL },
         { HELP_KEY, "help", NULL, NULL },
         { WWW_KEY, "www", NULL, NULL },

plugins/media-keys/msd-media-keys-manager.c

@@ -976,6 +976,12 @@ do_action (MsdMediaKeysManager *manager,
         case EMAIL_KEY:
                 do_url_action (manager, "mailto");
                 break;
+        case CONTROL_CENTER_KEY:
+                if ((cmd = g_find_program_in_path ("mate-control-center")))
+                        execute (manager, "mate-control-center", FALSE, FALSE);
+
+                g_free (cmd);
+                break;
         case SCREENSAVER_KEY:
                 if ((cmd = g_find_program_in_path ("mate-screensaver-command"))) {
                         execute (manager, "mate-screensaver-command --lock", FALSE, FALSE);