misc: fix issues pointed out by msvc (#7316)

* do not move constant variables

* applet_manager: avoid possible use after move

* use constant references where pointed out by msvc

* extra_hid: initialize response

* ValidateSaveState: passing slot separately is not necessary

* common: mark HashCombine as nodiscard

* cityhash: remove use of using namespace std

* Prefix all size_t with std::

done automatically by executing regex replace `([^:0-9a-zA-Z_])size_t([^0-9a-zA-Z_])` -> `$1std::size_t$2`
based on 7d8f115

* shared_memory.cpp: fix log error format

* fix compiling with pch off

src/core/dumping/ffmpeg_backend.cpp

@@ -1073,7 +1073,7 @@ std::vector<FormatInfo> ListFormats() {
             continue;
         }
 
-        out.push_back({current->name, ToStdString(current->long_name), std::move(extensions),
+        out.push_back({current->name, ToStdString(current->long_name), extensions,
                        std::move(supported_video_codecs), std::move(supported_audio_codecs),
                        GetOptionList(current->priv_class, true)});
     }