Modify Server for InfoSource plugins

[joel99]

We need to adjust the server to be able to retrieve information from the InfoSource plugins. sendMessage should have a few variations. sendMessage will optionally take a source parameter that can be populated as follows:

• Provided a dictionary of user objects in the raw query.
• Provided a dictionary of InfoSource names and values that are also dictionaries that satisfy the filter function mentioned in InfoSource plugins #28. (Some kind of filter format should be provided by InfoSource)
  We need more information on what we can target. The server should provide a method for retrieving what InfoPlugins are available and what filtering groups they have and what information they can provide.
  If InfoSources are provided in source, run the InfoSource plugins filter with the parameters given in the request. Hold onto the information for later processing.

If the source parameter is not specified, the server will skip any info retrieval processing and default to BuildGT MVP behavior or directly routing a message to presumably broadcasting plugins.
Part of the #13 epic.