Debugger: Use more robust way to look up QMapNode types

LLDB needs exactly the same spacing as in the debug info.

Change-Id: I8a2e17cd4c6a167d273f31f4e7ff63c149a5d34b
Reviewed-by: hjk <hjk121@nokiamail.com>
QmlDesigner.PropertyEditor: fix property name in LayoutSection

Change-Id: I3ca4d1930a90c9d84019061f32a8d34d646fce98
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>