QmlDesigner: Change misleading name in designer options

Change Snap Margins in Parent item padding and item spacing to sibling
item spacing.

Change-Id: I4356cb415c93689e8dde96ad195aab254edabbc2
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>
Debugger: Don't show LLDB's "synthetic" name suffix

Change-Id: I4229792171edef807619ec4e68393ec3e91e12dc
Reviewed-by: hjk <hjk121@nokiamail.com>