refactor: Move fs.* to util/fs.*

The fs.* files are already part of the libbitcoin_util library. With the
introduction of the fs_helpers.* it makes sense to move fs.* into the
util/ directory as well.

src/qt/guiutil.cpp

@@ -12,7 +12,6 @@
 
 #include <base58.h>
 #include <chainparams.h>
-#include <fs.h>
 #include <interfaces/node.h>
 #include <key_io.h>
 #include <policy/policy.h>
@@ -21,6 +20,7 @@
 #include <script/script.h>
 #include <script/standard.h>
 #include <util/exception.h>
+#include <util/fs.h>
 #include <util/fs_helpers.h>
 #include <util/system.h>
 #include <util/time.h>

src/qt/guiutil.h

@@ -6,10 +6,10 @@
 #define BITCOIN_QT_GUIUTIL_H
 
 #include <consensus/amount.h>
-#include <fs.h>
 #include <net.h>
 #include <netaddress.h>
 #include <util/check.h>
+#include <util/fs.h>
 
 #include <QApplication>
 #include <QEvent>

src/qt/intro.cpp

@@ -7,9 +7,9 @@
 #endif
 
 #include <chainparams.h>
-#include <fs.h>
 #include <qt/intro.h>
 #include <qt/forms/ui_intro.h>
+#include <util/fs.h>
 
 #include <qt/guiconstants.h>
 #include <qt/guiutil.h>

src/qt/psbtoperationsdialog.cpp

@@ -5,7 +5,6 @@
 #include <qt/psbtoperationsdialog.h>
 
 #include <core_io.h>
-#include <fs.h>
 #include <interfaces/node.h>
 #include <key_io.h>
 #include <node/psbt.h>
@@ -14,6 +13,7 @@
 #include <qt/forms/ui_psbtoperationsdialog.h>
 #include <qt/guiutil.h>
 #include <qt/optionsmodel.h>
+#include <util/fs.h>
 #include <util/strencodings.h>
 
 #include <fstream>

src/qt/walletframe.cpp

@@ -4,7 +4,6 @@
 
 #include <qt/walletframe.h>
 
-#include <fs.h>
 #include <node/interface_ui.h>
 #include <psbt.h>
 #include <qt/guiutil.h>
@@ -12,6 +11,7 @@
 #include <qt/psbtoperationsdialog.h>
 #include <qt/walletmodel.h>
 #include <qt/walletview.h>
+#include <util/fs.h>
 #include <util/fs_helpers.h>
 
 #include <cassert>