rename 'files' to 'io'

src/content/ContentReport.cpp

@@ -4,7 +4,7 @@
 
 #include "coders/json.hpp"
 #include "constants.hpp"
-#include "files/files.hpp"
+#include "io/io.hpp"
 #include "items/ItemDef.hpp"
 #include "voxels/Block.hpp"
 #include "world/World.hpp"
@@ -75,7 +75,7 @@ std::shared_ptr<ContentReport> ContentReport::create(
         return nullptr;
     }
 
-    auto root = files::read_json(filename);
+    auto root = io::read_json(filename);
     uint regionsVersion = 2U; // old worlds compatibility (pre 0.23)
     root.at("region-version").get(regionsVersion);
     auto& blocklist = root["blocks"];