Allow configuration of more parameters via repository options file

[gudmdharalds]

Currently we only allow a few options to be configured via repository configuration file. We should allow more options to be configured this way.

The following options should be configurable. All are boolean:

• --hashes-api
• --autoapprove
• --autoapprove-php-nonfunctional-changes
• --results-comments-sort
• --review-comments-include-severity
• --phpcs
• --svg-checks

The following are more complex to implement, and so will be implemented in a later phase:

• --review-comments-max (integer)
• --review-comments-total-max (integer)
• --review-comments-ignore (string)
• --branches-ignore (string)
• --lint (boolean)

Look into in more detail:

• --phpcs-runtime-set (array of strings)