* Allow modules to be built regardless of their declaring type.

* Need to exclude submodules.

This fixes an issue where custom ModuleBases that contained a generic
parameter would be loaded as a module - only to fail when trying to be
built.

Realistically, ModuleBases _should_ be abstract - but it was still a bug
that we allowed them to be included as a module.

commit 5b047bf02b
Author: Joe4evr <jii.geugten@gmail.com>
Date:   Fri Feb 2 22:22:00 2018 +0100

    [feature/OnModuleAdded] Quickstart fixes (#946)

    * Quickstart: fix minor derp

    * Other overdue fixes

commit bd3e9eee94
Author: Christopher F <computerizedtaco@gmail.com>
Date:   Sat Jan 27 16:51:18 2018 -0500

    Resort usings in ModuleBase

commit 8042767579
Author: Christopher F <computerizedtaco@gmail.com>
Date:   Sat Jan 27 16:41:39 2018 -0500

    Clean up removed owned IServiceProvider

commit 30066cb102
Author: Christopher F <computerizedtaco@gmail.com>
Date:   Sat Jan 27 16:37:22 2018 -0500

    Remove redundant try-catch around OnModuleBuilding invocation

    If this exception is going to be rethrown, there's no reason to include
    a try-catch.

commit 60c7c31d44
Author: Christopher F <computerizedtaco@gmail.com>
Date:   Sat Jan 27 16:36:27 2018 -0500

    Include the ModuleBuilder in OnModuleBuilding

    This allows modules hooking into OnModuleBuilding method to mutate
    theirselves at runtime.

commit b6a9ff5786
Author: Joe4evr <jii.geugten@gmail.com>
Date:   Mon Jan 22 13:17:14 2018 +0100

    #DERP

commit f623d19c68
Author: Joe4evr <jii.geugten@gmail.com>
Date:   Mon Jan 22 13:15:31 2018 +0100

    Resolution for #937 because it's literally 4 lines of code

commit 8272c9675b
Author: Joe4evr <jii.geugten@gmail.com>
Date:   Mon Jan 22 11:39:28 2018 +0100

    Re-adjust quickstart

commit e30b907135
Author: Joe4evr <jii.geugten@gmail.com>
Date:   Mon Jan 22 11:35:08 2018 +0100

    Undo experimental changes, request IServiceProvider instance everywhere instead

commit ad7e0a46c8
Author: Joe4evr <jii.geugten@gmail.com>
Date:   Fri Jan 19 03:40:27 2018 +0100

    Fix quickstart leftover from previous draft

commit e3349ef3d4
Author: Joe4evr <jii.geugten@gmail.com>
Date:   Fri Jan 19 03:33:46 2018 +0100

    Doc comment on items

commit 81bd9111fa
Author: Joe4evr <jii.geugten@gmail.com>
Date:   Fri Jan 19 03:16:44 2018 +0100

    Add comment about the ServiceProviderFactory in the quickstart

commit 72b5e6c8a1
Author: Joe4evr <jii.geugten@gmail.com>
Date:   Fri Jan 19 03:10:40 2018 +0100

    Remove superfluous comments, provide simpler alternative for setting the ServiceProvider.

commit 74b17b0e04
Author: Joe4evr <jii.geugten@gmail.com>
Date:   Tue Jan 16 18:06:28 2018 +0100

    Experimental change for feedback

commit 7b100e99bb
Author: Joe4evr <jii.geugten@gmail.com>
Date:   Mon Jan 15 23:34:06 2018 +0100

    * Make the service provider parameters required

    * Adjust quickstart guide to reflect changes

commit 7f1b792946
Author: Joe4evr <jii.geugten@gmail.com>
Date:   Mon Jan 15 20:04:37 2018 +0100

    I..... missed one.

commit 031b289d80
Author: Joe4evr <jii.geugten@gmail.com>
Date:   Mon Jan 15 20:02:20 2018 +0100

    Rename method to more intuitive 'OnModuleBuilding'

commit 9a166ef1d0
Author: Joe4evr <jii.geugten@gmail.com>
Date:   Mon Jan 15 19:09:10 2018 +0100

    Add callback method for when a module class has been added to the CommandService.

Why am I such a bad programmer? Maybe I'm just bad with git. Maybe I'm
just bad in general. Maybe I should resign from programming.

* Allow commands to return a Task<RuntimeResult>

This allows bot developers to centralize command result logic by
using result data whether the command as successful or not.

Example usage:
```csharp
var _result = await Commands.ExecuteAsync(context, argPos);
if (_result is RuntimeResult result)
{
    await message.Channel.SendMessageAsync(result.Reason);
}
else if (!_result.IsSuccess)
{
    // Previous error handling
}
```

The RuntimeResult class can be subclassed too, for example:
```csharp
var _result = await Commands.ExecuteAsync(context, argPos);
if (_result is MySubclassedResult result)
{
    var builder = new EmbedBuilder();
    for (var pair in result.Data)
    {
        builder.AddField(pair.Key, pair.Value, true);
    }
    await message.Channel.SendMessageAsync("", embed: builder);
}
else if (_result is RuntimeResult result)
{
    await message.Channel.SendMessageAsync(result.Reason);
}
else if (!_result.IsSuccess)
{
    // Previous error handling
}
```

* Make RuntimeResult's ctor protected

* Make RuntimeResult abstract

It never really made sense to have it instantiable in the first place,
frankly.

* Allow arbitrary attributes to be added to commands

I still don't approve adding type info back into commands, so
I decided to use this solution for allowing arbitrary attributes to be
added to commands.

Add attributes property to ParameterBuilder

Add Attributes properties to info types

* Why on earth git

* Add using for system so that Attribute can be used

* C#7 features in commands, CommandInfo in ModuleBase

* Update TypeReaders with C#7 features and IServiceProvider

* Add best-choice command selection to CommandService

* Normalize type reader scores correctly

* Fix logic error and rebase onto dev

* Change GetMethod for SetMethod in ReflectionUtils

Should be checking against setters, not getters

* Ensure args/params scores do not overwhelm Priority

* Remove possibility of NaNs

A.K.A. "FiniteReality is a twat"

This commit also adds a TypeReaders property to CommandService, so
it is possible to see all of the registered TypeReaders. This makes
it possible for users to implement their own parsing instead of
using the built-in parsing.