Created iota extension interface
Created by: paulhandy
Javascript files can be created in a folder, defaulted to "./ixi/", subject to javax.script.scriptengine constraints. Currently, they are automatically loaded into the IRI, and have full access to all classes, except the IXI class itself.
A script can register a "shutdown" function, so that it can be cleanly removed at the call of the IRI shutdown.
API endpoints can be registered, and are callable by <script name>.<name of registered command>
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