Everywhere: Remove klog(), dbg() and purge all LogStream usage :^)

Good-bye LogStream. Long live AK::Format!

Userland/Tests/Kernel/kill-pidtid-confusion.cpp

@@ -25,11 +25,11 @@
  */
 
 #include <AK/Assertions.h>
-#include <AK/LogStream.h>
+#include <AK/Format.h>
 #include <LibPthread/pthread.h>
-#include <fcntl.h>
 #include <signal.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <unistd.h>
 
 /*

Userland/Tests/Kernel/setpgid-across-sessions-without-leader.cpp

@@ -25,7 +25,7 @@
  */
 
 #include <AK/Assertions.h>
-#include <AK/LogStream.h>
+#include <AK/Format.h>
 #include <fcntl.h>
 #include <serenity.h>
 #include <stdio.h>

Userland/Tests/LibGfx/font.cpp

@@ -28,7 +28,7 @@
 #include <LibGfx/FontDatabase.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <string.h>
+#include <unistd.h>
 
 static void test_fontdatabase_get_by_name()
 {