Pyustc

Added
- Browser login module for passport.
- Gradesheet query module.
- The function to get the list of the Second Class applicants.

Changed
- Merge the `auto cancel and apply` function of Second Class into the parameters of the `apply` function.

Removed
- The wrapper for setting the root url.

Added
- Login to Passport through default environment variables.
- Add/drop lessons directly through the lesson code.

Fixed
- Unable to parse results when adding/droping lessons successfully.

Changed
- Use context for Young Platform operations.

Added
- Course Adjustment System.
- Lesson search function that supports more parameters.

Changed
- Network interface used for Passport login.

Removed
- Verification code processing module.

Added
- Course selection system support.

Fixed
- The filtering function for obtaining information from the second lesson is incorrect.

Added
- Filter Second Class by time period.
- Automatically cancel application for Second Class with duplicate application times.

Fixed
- Error when obtaining the course schedule.
- Cannot use string matching when matching courses based on location.