Should be able to set the default zoom level for a camera

[stubb]

From @prock-fife on May 19, 2010 0:32

When you save a map with the editor it saves the current zoom level of the camera in the editor itself. You should be able to set the zoom level of the camera and the editor should not clobber its value.

Copied from original issue: fifengine/fifengine#467