Move internal settings headers into /internal/ dir

The additional headers are not intended to be public. To reinforce that
it is a bad idea to include these they are put into the /internal/
directory.

src/settings/internal/settings_controller.h

@@ -3,9 +3,9 @@
 #include <array>
 #include <vector>
 #include <easylogging++.h>
-#include "settings.h"
+#include "../settings.h"
 #include "setting_value.h"
-#include "../utils/setup.h"
+#include "../../utils/setup.h"
 #include "specific_setting_value.h"
 
 namespace settings

src/settings/internal/settings_internal.h

@@ -2,7 +2,7 @@
 #include <QSettings>
 #include <string>
 #include <type_traits>
-#include "../overlaycontroller.h"
+#include "../../overlaycontroller.h"
 
 namespace settings
 {

src/settings/internal/specific_setting_value.h

@@ -1,7 +1,7 @@
 #pragma once
 #include <type_traits>
 #include "setting_value.h"
-#include "settings.h"
+#include "../settings.h"
 
 namespace settings
 {

src/settings/settings.cpp

@@ -2,7 +2,7 @@
 #include <QSettings>
 #include <easylogging++.h>
 #include "../overlaycontroller.h"
-#include "settings_controller.h"
+#include "internal/settings_controller.h"
 
 namespace settings
 {