Changes

enhance "Incoming Thing Updates" in UI to provide more information at a glance

* added 2 columns "Action" (e.g. showing "merged" or "modified") and "Path" (showing on which level) to the table
* prioritized "_context" over "features" and "attributes" to extract "Field(s)" from - only done for actions on path "/"
* added a selection to the "Thing Update Detail" view which information to display from the selected event

Signed-off-by: Thomas Jäckle <thomas.jaeckle@beyonnex.io>
 (commit: afed1ad)