Add support for parsing multiple types of quotation marks in commands, Fix #942 (#943)

* Add ability to support different types of quotation marks

* Added normal quotation mark to list of aliases, removed single quote mark

* clean up leftover changes from testing

* change quotation mark parsing to use a map of matching pairs

* remove commented out code

* Fix conventions of the command parser utility functions

* change storage type of alias dictionary to be IReadOnlyDictionary

* revert type of CommandServiceConfig QuotationMarkAliasMap to Dictionary

* minor formatting changes to CommandParser

* remove unnecessary whitespace

* Move aliases outside of CommandInfo class

* copy IReadOnlyDictionary to ImmutableDictionary

* minor syntax changes in CommandServiceConfig

* add newline before namespace for consistency

* newline formatting tweak

* simplification of GetMatch method for CommandParser

* add more quote unicode punctuation pairs

* add check for null value when building ImmutableDictionary

* Move default alias map into a separate source file

* Ensure that the collection passed into command service is not null

src/Discord.Net.Commands/Info/CommandInfo.cs

@@ -1,4 +1,4 @@
-using Discord.Commands.Builders;
+using Discord.Commands.Builders;
 using System;
 using System.Collections.Generic;
 using System.Collections.Immutable;
@@ -121,7 +121,8 @@ namespace Discord.Commands
                 return ParseResult.FromError(preconditionResult);
 
             string input = searchResult.Text.Substring(startIndex);
-            return await CommandParser.ParseArgsAsync(this, context, services, input, 0).ConfigureAwait(false);
+
+            return await CommandParser.ParseArgsAsync(this, context, _commandService._ignoreExtraArgs, services, input, 0, _commandService._quotationMarkAliasMap).ConfigureAwait(false);
         }
 
         public Task<IResult> ExecuteAsync(ICommandContext context, ParseResult parseResult, IServiceProvider services)