New Dynamo menu styling
Merge pull request #473 from SkyApple/UIStylingChocoButterUI

New Dynamo menu styling
SaveNode Part
Changed LoadNode and SaveNode to now save/load the LacingStrategy/Preview/PreviewUpstream. Also called base.SaveNode/LoadNode from all derived overriden functions.
Change the LoadNode to use the XmlElementHelper Class. Also added to the summary of LoadNode and SaveNode
Change Enum of XmlElementHelper