fix some warnings

headers/enduro2d/high/asset.hpp

@@ -91,7 +91,7 @@ namespace e2d
         };
 
         template < typename Asset >
-        class typed_asset_cache : public asset_cache {
+        class typed_asset_cache final : public asset_cache {
         public:
             using asset_ptr = typename Asset::ptr;
         public:

headers/enduro2d/high/factory.hpp

@@ -111,7 +111,7 @@ namespace e2d
     // factory
     //
 
-    class factory : public module<factory> {
+    class factory final : public module<factory> {
     public:
         factory() = default;
         ~factory() noexcept final = default;

headers/enduro2d/high/inspector.hpp

@@ -187,7 +187,7 @@ namespace e2d
     // inspector
     //
 
-    class inspector : public module<inspector> {
+    class inspector final : public module<inspector> {
     public:
         inspector() = default;
         ~inspector() noexcept final = default;

sources/enduro2d/utils/filesystem_impl/files_posix.cpp

@@ -101,7 +101,7 @@ namespace
         int handle_ = -1;
     };
 
-    class write_file_posix : public write_file {
+    class write_file_posix final : public write_file {
     public:
         write_file_posix(str path, bool append)
         : path_(std::move(path))

sources/enduro2d/utils/filesystem_impl/files_winapi.cpp

@@ -14,7 +14,7 @@ namespace
 {
     using namespace e2d;
 
-    class read_file_winapi : public read_file {
+    class read_file_winapi final : public read_file {
     public:
         read_file_winapi(str path)
         : path_(std::move(path))
@@ -120,7 +120,7 @@ namespace
         HANDLE handle_ = INVALID_HANDLE_VALUE;
     };
 
-    class write_file_winapi : public write_file {
+    class write_file_winapi final : public write_file {
     public:
         write_file_winapi(str path, bool append)
         : path_(std::move(path))