Use string_view for readonly string properties

apps/openmw/mwlua/factionbindings.cpp

@@ -122,7 +122,8 @@ namespace MWLua
             return "ESM3_FactionRank[" + rec.mFactionId.toDebugString() + ", " + std::to_string(rec.mRankIndex + 1)
                 + "]";
         };
-        rankT["name"] = sol::readonly_property([](const FactionRank& rec) { return rec.mRankName; });
+        rankT["name"]
+            = sol::readonly_property([](const FactionRank& rec) -> std::string_view { return rec.mRankName; });
         rankT["primarySkillValue"] = sol::readonly_property([](const FactionRank& rec) { return rec.mPrimarySkill; });
         rankT["favouredSkillValue"] = sol::readonly_property([](const FactionRank& rec) { return rec.mFavouredSkill; });
         rankT["factionReaction"] = sol::readonly_property([](const FactionRank& rec) { return rec.mFactReaction; });

apps/openmw/mwlua/vfsbindings.cpp

@@ -161,7 +161,8 @@ namespace MWLua
         auto vfs = MWBase::Environment::get().getResourceSystem()->getVFS();
 
         sol::usertype<FileHandle> handle = context.mLua->sol().new_usertype<FileHandle>("FileHandle");
-        handle["fileName"] = sol::readonly_property([](const FileHandle& self) { return self.mFileName; });
+        handle["fileName"]
+            = sol::readonly_property([](const FileHandle& self) -> std::string_view { return self.mFileName; });
         handle[sol::meta_function::to_string] = [](const FileHandle& self) {
             return "FileHandle{'" + self.mFileName + "'" + (!self.mFilePtr ? ", closed" : "") + "}";
         };