provide procedures in order to change configuration at runtime

[conker84]

Some procedure like:
CALL streams.config.setValue(‘streams.source.topic.nodes.neo4j-outbound’, ‘SomeNewValue’)
Thanks to @moxious

[moxious]

Related
#181

[moxious]

Adding to this, from @davefauth

There has to be a way to dynamically add / modify / remove configuration settings.

(Customer) wants to use this but doesn't want to have downtime every time you change the topic cypher or add a topic

if it is in the config file, then let us reload the config file

Graphaware did that in some instances.