Alternate attendance options #1612

Ion should support more methods for taking attendance. Two main Ion-supported ways are currently used:

• Teacher calls and marks students
• Students check off on printed attendance sheet
• CSV import

Other non-official ways include:

• Signing in by filling out a Google Form (especially for large activities)

Ideas for new attendance methods:

• Scanning a QR code/link -> takes students to a page that automatically marks them present
  • Keep track of time response is recorded (should be within block)
• Students input a code (that the teacher displays) into an attendance box on Ion
• ...more ideas welcome