Move to Simplified Imports

Import statements are messy, right now. This is mostly because we've got to maintain some sense of structure to allow the imports to work for both the deployed application and the test system.

try:
    from backend import api, auth, configuration, __header__, __version__
    from backend.storage import SessionManager
    from backend.configuration.models import(
        StateEventInfo, DistrictEventInfo, CountyEventInfo, NationalEventInfo
    )
except ImportError:
    import api
    import auth
    import configuration
    from __init__ import __header__, __version__
    from storage import SessionManager
    from configuration.models import(
        StateEventInfo, DistrictEventInfo, CountyEventInfo, NationalEventInfo
    )

It seems those could be modified to clean them up substantially:

from . import api, auth, configuration, __header__, __version__
from .storage import SessionManager
from .configuration.models import(
    StateEventInfo, DistrictEventInfo, CountyEventInfo, NationalEventInfo
)