Get the underlying Mesh from a Topography Element
Remove deleted nodes from node state table in sync data manager
Rename State.NoChange to State.Clean
Merge pull request #1745 from ke-yu/fix_Magn3605

Remove deleted nodes from node state table in sync data manager
Double, Integer slider should default to 0
Added F5 key binding for running the graph
Unify slider UI creation into single method, place expander to the right of input box to remove empty line
Merge branch 'master' of https://github.com/DynamoDS/Dynamo
Extend IPreferences and PreferenceSettings for RecentFiles and MaxNumRecentFiles, display RecentFiles in File menu, improve quality of FilePathDisplayConverter