Voting enhancements

[Razer2015]

Add support for voting with numbers !1 2 3

Also possibly add an option for voting with shorter map names? The shortest unambiguous name. For example: !metro !metr !met

Configurable shortest character count to prevent conflicts with other plugins? Or perhaps an option to add reserved commands in blacklist?

[Kiiyya]

The way to do this would be to add a parse_map function on MapPool which handles the numbers etc, since it stores the maps in a vector a not a hash map. Though, maybe the better would be to convert MapPool to use a hash map internally, and instead store the map vote numbers in the Extra (generic param, currently ()).

Or just get rid of MapPool entirely and add traits for HashMap<MapInPool>? Maybe while I'm at it, remove MapInPool too lol, and replace it with traits too. Hmm...

[Kiiyya]

Length consideration:

• len("Vote with numbers or names:\n") = 24
• len(tab-padded map name) = 11
• One option: len("{}\t {}", number, tab-padded map name) = 3 + 11 = 14
• One line: \t + (3 options) + \n = 2 + 3 * 14 = 44

So in total, for at most 6 options, you get an upper bound of 24 + 44 * 2 = 112 characters, which is less than 127 characters, so it'll work.

...And that's about as much as I have energy for, for the whole week, likely.