Add bounty tools to utils/ folder

[flibitijibibo]

This one's for @JohanSmet and @lamarqua.

While working on 3D, filters, and reverb you guys came up with a bunch of good tools to test these features. Let's try and get those into the FAudio repo.

I added a utils/ folder that now hosts testparse and facttool, but more importantly I split up the UI stuff I wrote for facttool and put it in a "uicommon" folder. This folder does all the boring stuff like rendering/input and ImGui interop, so you don't have to use the ImGui example code or other third-party bits, and it has a few declarations that tools can use:

https://github.com/flibitijibibo/FACT/blob/master/utils/uicommon/FAudioUI_main.c#L48

So you define those parts in your tool somewhere and then it should Just Work without any window/UI setup on your part; here's facttool as an example:

https://github.com/flibitijibibo/FACT/blob/master/utils/facttool/facttool.cpp

Pretty easy to use I hope! And of course if it's just a console-only program that just prints stuff, you can ignore this.

For now we're only going to add tools to the Makefile, since we're probably going to get into C/C++ features that VS2010 doesn't like, and right now I don't really care about that target for tests... MinGW works just fine for these. That's also pretty quick, since I'm just adding them as separate uberbuilds:

https://github.com/flibitijibibo/FACT/blob/master/Makefile#L68

We'll do VS2010 later on, since some of these tools do have the option to use XAudio2 alongside FAudio and that can be really useful. But that's busy work I can do later!

[JohanSmet]

I created a PR (#14) that adds both the filter and reverb tools.

[flibitijibibo]

Excellent, just merged those in. Just need the 3D stuff and I can close this; it’s not mission-critical so no rush!

[flibitijibibo]

Since filing this issue a tests/ folder has been added:

https://github.com/FNA-XNA/FAudio/tree/master/tests

So Adrien’s work may fit better in this category. Would be great to have X3DAudio tests alongside the XAudio2 tests!

[lamarqua]

I'm gonna be on vacation soon and will get on it!