Layout editor

NOTE: MyGUI does not support plugins for Mac OSX yet (https://github.com/MyGUI/mygui/issues/42), so editing OpenMW layouts is currently not possible on that platform.


 * Install MyGUI version 3.2.2 from https://github.com/MyGUI/mygui.
 * Make sure you are using OpenMW 0.35 or later and have the Plugin_MyGUI_OpenMW_Resources library available in your OpenMW install.
 * Copy the Plugin_MyGUI_OpenMW_Resources library file from the OpenMW build folder to the directory you will be running the MyGUI Layout Editor from (most likely the "bin" subdirectory in MyGUI's build directory).
 * Start the MyGUI LayoutEditor.
 * Go to File -> Settings -> Folders, press Add and select the folder in your OpenMW repository containing the MyGUI layouts (files/mygui)
 * Go to File -> Settings -> Resources, press Add, type core_layouteditor.xml, then press Enter.
 * Restart the LayoutEditor and try to load a .layout file from OpenMW. It should be working now!
 * Note that when you save a layout, you need to run OpenMW's cmake script in order to copy it to OpenMW's build folder, so that the new layout is used when you start OpenMW.