Add support for properties for TwitchHelpMessage and TwitchManualCode

[Emik03]

Pretty self-explanatory, currently it can only grab fields with the name, I hope to see it be supported with properties. For instance people can create an abstract class to make TP support easier to implement...

internal abstract string TwitchHelpMessage { get; }

...Or people can make more dynamic help commands based on what the module is, to not have to assign the field.

internal string TwitchHelpMessage
{
    get
    {
        if (someCondition)
            return @"SomeConditionHelpMessage";
        if (someOtherCondition)
            return @"SomeOtherConditionHelpMessage";
        return @"DefaultHelpMessage";
    }
}