Add optional parameters to api call handling

[stelar7]

With v4 coming in 60 days, we need to change the encrypted id into a real id. (not possible).

Options;

• add !{paramname} {param} before/after the url to specify it.
  https://euw1.api.riotgames.com/lol/match/v4/matchlists/by-account/kasdfGSDFhdFGASftW546sefg !summoner Kalturi

• add the username as the param, instead of the id
  https://euw1.api.riotgames.com/lol/match/v4/matchlists/by-account/Kalturi

[Querijn]

I have something in the works for this. I'll take this one.