Load profiles from file instead of config

[cswaney]

The application doesn't pick up changes to profiles because it uses the state of the profiles file at the time the app is launched (the state is loaded into config).

The simplest solution is to instead store the location of the profiles file and reload this file every time that profiles are needed. This is slower, but it allows us to keep profiles in an easily editable format (versus storing profiles in the database), and still gives us fresh profile data on every call.

More specifically, we currently store profiles in config.BLACKFISH_PROFILES as BlackfishProfiles. Everywhere that we currently use config.BLACKFISH_PROFILES, we need to instead store the profile path to config.BLACKFISH_PROFILE and run:

profiles = load_profiles(config.BLACKFISH_PROFILE)
profile = profiles[name]

every time that we need a profile.