[dev] Hook for render comments

[Duck]

I don't know it this is the right approach....  I have several sites/apps 
where I'm tyring to use the Agora comments API. It came out that I'm forced 
to modify the code on every update, because the comments output is not 
templated So I create a hook which controls the threads output. 

I attached a patch for Ansel that calls the hook and two version of hooks 
function. Is something in this way acceptable or I must handle it by my own?

Duck
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