Support for includes w/o use for external libraries

Author: pschatzmann

src/AudioEffects/STKEffects.h

@@ -1,7 +1,6 @@
 #pragma once
 
 #include "AudioConfig.h"
-#ifdef USE_STK
 #include "AudioEffects/AudioEffect.h"
 #include "Effect.h"
 #include "Stk.h"
@@ -165,5 +164,3 @@ class STKPitShift : public AudioEffect, public stk::PitShift {
 };
 
 } // namespace audio_tools
-
-#endif

src/AudioLibs/AudioA2DP.h

@@ -8,7 +8,6 @@
 #pragma once
 
 #include "AudioConfig.h"
-#ifdef USE_A2DP
 
 #include "AudioTools.h"
 #include "BluetoothA2DPSink.h"
@@ -383,9 +382,4 @@ class A2DPStream : public AudioStream, public AudioBaseInfoSource {
 
 };
 
-
-
-
 }
-
-#endif

src/AudioLibs/AudioESP8266.h

@@ -1,7 +1,6 @@
 #pragma once
 
 #include "AudioConfig.h"
-#ifdef USE_ESP8266_AUDIO
 #include "AudioTools.h"
 #include "AudioOutput.h"
 #include "SoundData.h"
@@ -67,4 +66,3 @@ class AudioOutputWithCallback : public AudioOutput, public BufferedStream {
 
 }
 
-#endif

src/AudioLibs/AudioMozzi.h

@@ -1,8 +1,6 @@
 #pragma once
 
 #include "AudioConfig.h"
-#ifdef USE_MOZZI
-
 #include "mozzi_config.h"
 #include "hardware_defines.h"
 #include "mozzi_analog.h"
@@ -295,4 +293,3 @@ class MozziStream : public AudioStream {
 
 } // Namespace
 
-#endif  // USE_MOZZI

src/AudioTools.h

@@ -27,11 +27,29 @@
 #include "AudioHttp/AudioHttp.h"
 #include "AudioTools/AudioPlayer.h"
 #include "AudioEffects/AudioEffects.h"
+#include "AudioExperiments/AudioExperiments.h"
+
+/**
+ * ------------------------------------------------------------------------- 
+ * @brief Optional external libraries
+ * 
+ */
+
+#ifdef USE_MOZZI
 #include "AudioLibs/AudioMozzi.h"
+#endif
+
+#ifdef USE_STK
 #include "AudioLibs/AudioSTK.h"
+#endif
+
+#ifdef USE_ESP8266_AUDIO
 #include "AudioLibs/AudioESP8266.h"
+#endif
+
+#ifdef USE_A2DP
 #include "AudioLibs/AudioA2DP.h"
-#include "AudioExperiments/AudioExperiments.h"
+#endif
 
 
 /**