Feature/localization rework

[Dliix66]

Added some more methods to simplify localization out of a command's context

[roflmuffin]

Looks okay to me, might be worth adding a XML doc comment to the methods and updating the example plugin?

[Dliix66]

I can do that 👍

[frederikstonge]

Since IStringLocalizer can be injected in other classes, would it not be better to create extension methods on IStringLocalizer?

    public static class LocalizerExtensions
    {
        public static string ForPlayer(this IStringLocalizer localizer, CCSPlayerController player, string key)
        {
            if (player == null || player.IsValid == false)
                return "";

            using WithTemporaryCulture temporaryCulture = new WithTemporaryCulture(player.GetLanguage());
            return localizer[key];
        }

        public static string ForPlayer(this IStringLocalizer localizer, CCSPlayerController player, string key, params object[] args)
        {
            if (player == null || player.IsValid == false)
                return "";

            using WithTemporaryCulture temporaryCulture = new WithTemporaryCulture(player.GetLanguage());
            return localizer[key, args];
        }
    }

[Dliix66]

@roflmuffin I updated the example plugin and this should be available in the docs too.

[roflmuffin]

I've added these as extension methods in build #258, which I think is cleaner/more extensible than amending the base class in this PR.