source tree cleanup

The lib/ directory was getting a bit out of hand, so this tries
to organize things a bit so it is easier going forward to locate
the code people want to patch.

tests/test-capture.c

@@ -17,9 +17,7 @@
  */
 
 #include <glib/gstdio.h>
-
-#include "sp-capture-reader.h"
-#include "sp-capture-writer.h"
+#include <sysprof.h>
 
 static void
 test_reader_basic (void)

tests/test-model-filter.c

@@ -1,6 +1,6 @@
 #include <sysprof-ui.h>
 
-#include "sp-model-filter.h"
+#include "util/sp-model-filter.h"
 
 #define TEST_TYPE_ITEM (test_item_get_type())
 

tests/test-zoom.c

@@ -1,4 +1,4 @@
-#include "sp-zoom-manager.h"
+#include "util/sp-zoom-manager.h"
 
 static void
 test_zoom_manager (void)