v2.0.0

This release splits Circleguard into circlecore (pip module) and circleguard (gui with pyqt as the frontend, using circlecore as the backend).

Changes:

• replays can be loaded from arbitrary locations (db, osu website, mirror website, osr file)
• convenience methods for common use cases added (checking a map or user)
• support for comparing two arbitrary replays (from two different maps, if you so choose)
• logging overhaul, any important action is logged
• major code cleanup
• removal of command line interface
• code standardized for pip upload (setup.py, __init__.py, etc)