rename 'files' to 'io'

src/frontend/UiDocument.cpp

@@ -2,7 +2,7 @@
 
 #include <utility>
 
-#include "files/files.hpp"
+#include "io/io.hpp"
 #include "graphics/ui/elements/UINode.hpp"
 #include "graphics/ui/elements/InventoryView.hpp"
 #include "graphics/ui/gui_xml.hpp"
@@ -59,7 +59,7 @@ std::unique_ptr<UiDocument> UiDocument::read(
     const fs::path& file,
     const std::string& fileName
 ) {
-    const std::string text = files::read_string(file);
+    const std::string text = io::read_string(file);
     auto xmldoc = xml::parse(file.u8string(), text);
 
     auto env = penv == nullptr 

src/frontend/locale.cpp

@@ -5,7 +5,7 @@
 #include "coders/json.hpp"
 #include "coders/commons.hpp"
 #include "content/ContentPack.hpp"
-#include "files/files.hpp"
+#include "io/io.hpp"
 #include "util/stringutil.hpp"
 #include "data/dv.hpp"
 #include "debug/Logger.hpp"
@@ -71,7 +71,7 @@ namespace {
 
 void langs::loadLocalesInfo(const fs::path& resdir, std::string& fallback) {
     auto file = resdir/fs::u8path(langs::TEXTS_FOLDER)/fs::u8path("langs.json");
-    auto root = files::read_json(file);
+    auto root = io::read_json(file);
 
     langs::locales_info.clear();
     root.at("fallback").get(fallback);
@@ -123,14 +123,14 @@ void langs::load(const fs::path& resdir,
     fs::path core_file = resdir/filename;
     
     if (fs::is_regular_file(core_file)) {
-        std::string text = files::read_string(core_file);
+        std::string text = io::read_string(core_file);
         Reader reader(core_file.string(), text);
         reader.read(lang, "");
     }
     for (auto pack : packs) {
         fs::path file = pack.folder/filename;
         if (fs::is_regular_file(file)) {
-            std::string text = files::read_string(file);
+            std::string text = io::read_string(file);
             Reader reader(file.string(), text);
             reader.read(lang, "");
         }

src/frontend/menu.cpp

@@ -8,7 +8,7 @@
 #include "engine/Engine.hpp"
 #include "data/dv.hpp"
 #include "interfaces/Task.hpp"
-#include "files/engine_paths.hpp"
+#include "io/engine_paths.hpp"
 #include "graphics/ui/elements/Menu.hpp"
 #include "graphics/ui/gui_util.hpp"
 #include "graphics/ui/GUI.hpp"

src/frontend/screens/LevelScreen.cpp

@@ -6,7 +6,7 @@
 #include "core_defs.hpp"
 #include "debug/Logger.hpp"
 #include "engine/Engine.hpp"
-#include "files/files.hpp"
+#include "io/io.hpp"
 #include "frontend/LevelFrontend.hpp"
 #include "frontend/hud.hpp"
 #include "graphics/core/DrawContext.hpp"