Configuration API Controller

[FranciscoCanas]

Implementation of the Configuration API as described here: https://docs.google.com/document/d/1efjdlFTFlYLX0XOYs1hIjBC6rxLRXBjMjiqUdPBHqSc/

Completed:

• Profiles
• General Configuration
• Recording Configuration
• Plugin Categories
• View and Patch Plugin Instance Config
• JSON schemas are provided with view requests.

Note: Freeseer's PluginManager has no support for listing available instances of some given plugin, and doesn't keep track of existing instances. The PluginManager will require some expansion, partly as described in #416, in order to fully support selecting specific plugin instances through this api.

[dideler]

I left some comments on the gdoc.

[mtomwing]

I suggest you move your code into a submodule folder instead of prefixing files with config<foobar>.py.