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/hle/kernel/resource_limit.h

@@ -68,7 +68,7 @@ public:
     bool Release(ResourceLimitType type, s32 amount);
 
 private:
-    using ResourceArray = std::array<s32, static_cast<size_t>(ResourceLimitType::Max)>;
+    using ResourceArray = std::array<s32, static_cast<std::size_t>(ResourceLimitType::Max)>;
     ResourceArray m_limit_values{};
     ResourceArray m_current_values{};
     std::string m_name;