Drop unused Config.h and SmallDataConvert.h includes

Config.h is edited about 100 times a year and each edit recompiled 198
files; now 172. SmallDataConvert.h pulls in arm_neon.h and was included by
headers that don't use it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Core/WaveFile.cpp

@@ -4,7 +4,6 @@
 
 #include "Core/WaveFile.h"
 #include "Common/Log.h"
-#include "Core/Config.h"
 
 WaveFileWriter::WaveFileWriter() {}