Cleanup includes

Improved manually with the help of neovim LSP warnings and iwyu:

    iwyu -Ibuilddir/app/ -Iapp/src/ app/src/XXX.c

app/src/trait/frame_sink.h

@@ -3,7 +3,6 @@
 
 #include "common.h"
 
-#include <assert.h>
 #include <stdbool.h>
 #include <libavcodec/avcodec.h>
 

app/src/trait/frame_source.c

@@ -1,5 +1,7 @@
 #include "frame_source.h"
 
+#include <assert.h>
+
 void
 sc_frame_source_init(struct sc_frame_source *source) {
     source->sink_count = 0;

app/src/trait/frame_source.h

@@ -3,7 +3,9 @@
 
 #include "common.h"
 
-#include "frame_sink.h"
+#include <stdbool.h>
+
+#include "trait/frame_sink.h"
 
 #define SC_FRAME_SOURCE_MAX_SINKS 2
 

app/src/trait/gamepad_processor.h

@@ -3,9 +3,6 @@
 
 #include "common.h"
 
-#include <assert.h>
-#include <stdbool.h>
-
 #include "input_events.h"
 
 /**

app/src/trait/key_processor.h

@@ -3,7 +3,6 @@
 
 #include "common.h"
 
-#include <assert.h>
 #include <stdbool.h>
 
 #include "input_events.h"

app/src/trait/mouse_processor.h

@@ -3,7 +3,6 @@
 
 #include "common.h"
 
-#include <assert.h>
 #include <stdbool.h>
 
 #include "input_events.h"

app/src/trait/packet_sink.h

@@ -3,7 +3,6 @@
 
 #include "common.h"
 
-#include <assert.h>
 #include <stdbool.h>
 #include <libavcodec/avcodec.h>
 

app/src/trait/packet_source.c

@@ -1,5 +1,7 @@
 #include "packet_source.h"
 
+#include <assert.h>
+
 void
 sc_packet_source_init(struct sc_packet_source *source) {
     source->sink_count = 0;

app/src/trait/packet_source.h

@@ -3,7 +3,9 @@
 
 #include "common.h"
 
-#include "packet_sink.h"
+#include <stdbool.h>
+
+#include "trait/packet_sink.h"
 
 #define SC_PACKET_SOURCE_MAX_SINKS 2