Add ACC_CALIB arming disabled reason if ACC is required but not calibrated

Checks various features, modes, and OSD elements to determine if ACC is needed. Generates an arming disabled warning if ACC calibration has never been completed.

src/main/osd/osd_elements.c

@@ -36,6 +36,8 @@
     Add the mapping from the element ID added in the first step to the function
     created in the third step to the osdElementDrawFunction array.
 
+    If the new element utilizes the accelerometer, add it to the osdElementsNeedAccelerometer() function.
+
     Finally add a CLI parameter for the new element in cli/settings.c.
 */
 
@@ -1779,4 +1781,27 @@ void osdUpdateAlarms(void)
 #endif
 }
 
+#ifdef USE_ACC
+static bool osdElementIsActive(osd_items_e element)
+{
+    for (unsigned i = 0; i < activeOsdElementCount; i++) {
+        if (activeOsdElementArray[i] == element) {
+            return true;
+        }
+    }
+    return false;
+}
+
+// Determine if any active elements need the ACC
+bool osdElementsNeedAccelerometer(void)
+{
+    return osdElementIsActive(OSD_ARTIFICIAL_HORIZON) ||
+           osdElementIsActive(OSD_PITCH_ANGLE) ||
+           osdElementIsActive(OSD_ROLL_ANGLE) ||
+           osdElementIsActive(OSD_G_FORCE) ||
+           osdElementIsActive(OSD_FLIP_ARROW);
+}
+
+#endif // USE_ACC
+
 #endif // USE_OSD