Kit: Save sticky kit information

Task-number: QTCREATORBUG-10485

Change-Id: I02081a45ce789992f22f79dc0fc3a60fe7ce439f
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
ProjectExplorer: SysRoot config widget is read-only when sticky/not-mutable

Change-Id: I39a04cc76896674e8df743cdc85a9f09c4857907
Reviewed-by: Mehdi Fekari <mfekari@blackberry.com>
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>