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/video_core/pica/shader_setup.h

@@ -21,15 +21,15 @@ struct Uniforms {
     std::array<bool, 16> b;
     std::array<Common::Vec4<u8>, 4> i;
 
-    static size_t GetFloatUniformOffset(u32 index) {
+    static std::size_t GetFloatUniformOffset(u32 index) {
         return offsetof(Uniforms, f) + index * sizeof(Common::Vec4<f24>);
     }
 
-    static size_t GetBoolUniformOffset(u32 index) {
+    static std::size_t GetBoolUniformOffset(u32 index) {
         return offsetof(Uniforms, b) + index * sizeof(bool);
     }
 
-    static size_t GetIntUniformOffset(u32 index) {
+    static std::size_t GetIntUniformOffset(u32 index) {
         return offsetof(Uniforms, i) + index * sizeof(Common::Vec4<u8>);
     }