Support GIFT format completely

[fuhrmanator]

Options

• [x] Line comments
• [x] Question name
• [x] Answer-specific feedback
• [x] General feedback with ####
• [x] Percentage answer weights
• [x] Multiple answers
• [x] Special characters (escaping)
• [x] Rich text
  • [x] HTML
  • [x] Markdown (spec?)
• [x] Specifying categories
• [ ] Making questions case sensitive

Question format examples

• [x] Multiple choice
• [x] Multiple choice with multiple right answers
• [x] True-false
• [x] Short answer
• [x] Matching
• [x] Missing word
• [x] Numerical questions
  • [x] Range format, e.g. {=1..5}
• [x] Essay questions
• [x] Description questions

(perhaps not complete list)

[fuhrmanator]

#16 allows support for [html], [markdown], etc.

[fuhrmanator]

See #44 as it was not included in this list.