AP_Math: added new rotation for PITCH_7

libraries/AP_Math/vector3.cpp

@@ -244,6 +244,15 @@ void Vector3<T>::rotate(enum Rotation rotation)
         x = tmp;
         return;
     }
+    case ROTATION_PITCH_7: {
+        const float sin_pitch = 0.12186934340514748f; // sinf(pitch);
+        const float cos_pitch = 0.992546151641322f; // cosf(pitch);
+        float tmpx = x;
+        float tmpz = z;
+        x =  cos_pitch * tmpx + sin_pitch * tmpz;
+        z = -sin_pitch * tmpx + cos_pitch * tmpz;
+        return;
+    }
     case ROTATION_CUSTOM: // no-op; caller should perform custom rotations via matrix multiplication
         return;
     }