Remove empty newlines in #include blocks.

This makes clang-format useful on those.

Also add a bunch of forgotten transitive includes, which otherwise
prevented compilation.

src/audio_core/codec.cpp

@@ -2,13 +2,11 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
+#include "audio_core/codec.h"
 #include <array>
 #include <cstddef>
 #include <cstring>
 #include <vector>
-
-#include "audio_core/codec.h"
-
 #include "common/assert.h"
 #include "common/common_types.h"
 #include "common/math_util.h"