Fixed broken formatter in ModuleTreeGrid.
Fixed broken formatter in ModuleTreeGrid.
CMS-3762 LiveEdit - Setting image on ImageComponent in duplicated layout fails
Renamed Region.updateParent to setParent, since this is the common method name for methods mutating a property.
Moved setting of regions parent to the LayoutComponent constructor, since this will be even more tighter.
CMS-3724 Replace ExtJS grid - Support for setting Nodes to be displayed

Updated TreeGrid styles.
Moved ContentGridPanel and ModuleTreeGrid styles to a separate files.
Added parent parameter's assertNull check to
`ModuleTreeGrid.fetchChildren()`
Renamed `ContentPath.getRelativePath()` to
`ContentPath.getLastElement()`