Promises are expensive and should not be used in the main
message handling path. The Switch node used them a lot if
the node references context - with a lot of duplicate code
to handle async and sync code paths.
This change modifies the code to use callbacks throughout
that are just as performant in either case.
switch node was missing font ( fa-ellipsis-h )
other nodes that have been updated with property option have the icon.
rbe-node and range-node have the icon to the left of property
its time the switch-node joins its siblings in uniformity.
