Add support for the Matterpoll plugin

[hloeung]

See https://github.com/42wim/matterircd/issues/414

|17:56 <matterpoll> hloeung: My question for my poll? [@@mf6mze5gw7ncbczrromg9jykjy]
|17:56 <matterpoll> * Option 1 [@@mf6mze5gw7ncbczrromg9jykjy]
|17:56 <matterpoll> * Option 2 [@@mf6mze5gw7ncbczrromg9jykjy]
|17:56 <matterpoll> --- [@@mf6mze5gw7ncbczrromg9jykjy]
|17:56 <matterpoll> *Total votes*: 0 [@@mf6mze5gw7ncbczrromg9jykjy]

Then when someone votes:

|17:56 <matterpoll> hloeung: My question for my poll? [@@mf6mze5gw7ncbczrromg9jykjy]
|17:56 <matterpoll> * Option 1 [@@mf6mze5gw7ncbczrromg9jykjy]
|17:56 <matterpoll> * Option 2 [@@mf6mze5gw7ncbczrromg9jykjy]
|17:56 <matterpoll> --- [@@mf6mze5gw7ncbczrromg9jykjy]
|17:56 <matterpoll> *Total votes*: 1 [@@mf6mze5gw7ncbczrromg9jykjy]
|17:56 <matterpoll>  (edited) [@@mf6mze5gw7ncbczrromg9jykjy]

Then when poll ends:

|17:56 <matterpoll> The poll **My question for my poll?** has ended and the original post has been updated. You can jump to it by pressing [here](https://chat..../_redirect/pl/mf6mze5gw7ncbczrromg9jykjy). (re @matterpoll: )
[↪@@mf6mze5gw7ncbczrromg9jykjy,@@budgb5z79jn38ekckrh7rhf51w]

[42wim]

:rocket: