branch_worker: PR comments pre-processing #29
                
     Merged
            
            
          
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The format of PR comments (which is github-style markdown) may not be suitable for plain-text email responses, depending on the use-case.
Implement a mechanism for pre-processing the contents of PR comments before forwarding them with email.
The function transforming the content string must be a method of BranchWorker class, and then its name can be specified (or not) in the pr_comments_forwarding of the KPD config.
If pre-processing function is not specified, couldn't be found or fails, the comment text remains unchanged.