CMS exit/save popup menu

Adds a new exit/save menu that can be displayed at any time using the yaw-right stick command. Yaw-left still functions as "back".

Allows the user to save their settings even while nested deep in multiple menus. Previously the user was required to back up all the way to the top level menu to save or exit.

src/main/cms/cms_menu_saveexit.c

@@ -0,0 +1,55 @@
+/*
+ * This file is part of Cleanflight and Betaflight.
+ *
+ * Cleanflight and Betaflight are free software. You can redistribute
+ * this software and/or modify this software under the terms of the
+ * GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option)
+ * any later version.
+ *
+ * Cleanflight and Betaflight are distributed in the hope that they
+ * will be useful, but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this software.
+ *
+ * If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <string.h>
+#include <ctype.h>
+
+#include "platform.h"
+
+#ifdef USE_CMS
+#include "cms/cms.h"
+#include "cms/cms_types.h"
+#include "cms/cms_menu_saveexit.h"
+
+#include "config/feature.h"
+
+#include "fc/config.h"
+
+static OSD_Entry cmsx_menuSaveExitEntries[] =
+{
+    { "-- SAVE/EXIT --", OME_Label, NULL, NULL, 0},
+    {"EXIT",        OME_OSD_Exit, cmsMenuExit,   (void *)CMS_EXIT, 0},
+    {"SAVE&EXIT",   OME_OSD_Exit, cmsMenuExit,   (void *)CMS_POPUP_SAVE, 0},
+    {"SAVE&REBOOT", OME_OSD_Exit, cmsMenuExit,   (void *)CMS_POPUP_SAVEREBOOT, 0},
+    { "BACK", OME_Back, NULL, NULL, 0 },
+    { NULL, OME_END, NULL, NULL, 0 }
+};
+
+CMS_Menu cmsx_menuSaveExit = {
+#ifdef CMS_MENU_DEBUG
+    .GUARD_text = "MENUSAVE",
+    .GUARD_type = OME_MENU,
+#endif
+    .entries = cmsx_menuSaveExitEntries
+};
+
+#endif