feature: source content measured against true license text

Whenever possible grant should attempt to obtain the originally analyzed license text and compare it to the official OSI license text. This can surface any changes made by the software publisher to the original text and allow the user to flag on or make choices about licenses that are shown to be significantly different than what they're labeled as.

No files, tests, or entry points are named. Start by locating the existing license-text acquisition and analysis flow, then determine how official OSI texts can be obtained and compared. Done means detected differences are surfaced clearly and users can flag or choose how significantly different labeled licenses are handled.

Written by the indexing model from the issue text.