SurveyingMaster

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1.Now you can return to the previous menu if you press on thre return button in every subroutine.
2.Change the axis switch into a dropdown in the settings container, where you can invert the horziontal and vertical axis easily.
3.Enlarge the help image to make a better show.
4.Update latest information in More Apps and About the App.
5.Fix some bugs in Levelling.
6.Fix the bug in the help imge of Coordinate Conversion.