Improve update performance of DynamicTreeTableViewer

Issue-Ref: 4182 Issue-URL: af3#4182 (closed)

For models with larger data dictionaries, the update of the data dictionary can become slow enough that editing element names becomes difficult. This commit changes the DynamicTreeTableViewer such that not the whole tree is re-build on every update. This solves the issue with the data dictionaries.

Signed-off-by: Ulrich Schöpp schoepp@fortiss.org