Include AudioTools.h in AudioLibs/AudioKit.h

AudioKit.h depends on some definitions in AudioTools.h but
it didn't (previously) explicitly include it. This was fine for me
until clang-format reordered my includes and then I got *very*
confusing errors.

This adds the #include "AudioTools.h" explicitly.

Author: ianloic

src/AudioLibs/AudioKit.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#include "AudioTools.h"
 #include "AudioKitHAL.h"
 #include "AudioI2S/I2SConfig.h"
 #include "AudioTools/AudioActions.h"