Bugfix/1032 trace explorer show evaluations of lambda nodes

[mgronover]

addresses issue: #1032

Values of nodes in lambda expression are used decorate the corresponding editor nodes.

[alexanderpann]

LGTM, one small remark:

InterpreterUserObjectDecorator#getMappedNode already assumes a LambdaExpression, so the method should probably only be used if the node contains an lambda expression or be renamed.

[mgronover]

LGTM, one small remark:

InterpreterUserObjectDecorator#getMappedNode already assumes a LambdaExpression, so the method should probably only be used if the node contains an lambda expression or be renamed.

It should be callable with any recorded node and checks if that recorded node is a descendent of a lambda expression (i. e. has an anchester that is a lmabda expression). If that is true the lambda expression may contain a user object, a map associating nodes contained in a model to nodes evaluated and contained in that trace.
So it gets the node that is contained in the model for any node that is recorded (these might be the same if no lambda expression is used).