Proof of concept for guideline references

[plaindocs]

Enable referencing external guidelines such as MISRA C as described in #147.

1. Edit conf.py to set up meta data for guidelines
2. Add misra field to test guideline
3. Set up filtered list in Standard Matrices appendix

-> standards matrix page showing the only Guideline with misra != ""

Assumptions:

• manual entry of misra field

To make this useful:

• Decided on required fields:
  • Rule (string) and URL for both MISRA C and CERT-C?
  • Is manual entry sufficient?
• Decide on output for standards page

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