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/renderer_software/sw_blitter.cpp

@@ -78,12 +78,12 @@ void SwBlitter::TextureCopy(const Pica::DisplayTransferConfig& config) {
         return;
     }
 
-    const size_t contiguous_input_size =
+    const std::size_t contiguous_input_size =
         config.texture_copy.size / input_width * (input_width + input_gap);
     rasterizer->FlushRegion(config.GetPhysicalInputAddress(),
                             static_cast<u32>(contiguous_input_size));
 
-    const size_t contiguous_output_size =
+    const std::size_t contiguous_output_size =
         config.texture_copy.size / output_width * (output_width + output_gap);
 
     // Only need to flush output if it has a gap
@@ -329,7 +329,7 @@ void SwBlitter::MemoryFill(const Pica::MemoryFillConfig& config) {
         // Fill with 32-bit values
         if (end > start) {
             const u32 value = config.value_32bit;
-            const size_t len = (end - start) / sizeof(u32);
+            const std::size_t len = (end - start) / sizeof(u32);
             for (std::size_t i = 0; i < len; ++i) {
                 std::memcpy(&start[i * sizeof(u32)], &value, sizeof(u32));
             }

src/video_core/renderer_software/sw_rasterizer.h

@@ -70,7 +70,7 @@ private:
     Memory::MemorySystem& memory;
     Pica::PicaCore& pica;
     Pica::RegsInternal& regs;
-    size_t num_sw_threads;
+    std::size_t num_sw_threads;
     Common::ThreadWorker sw_workers;
     Framebuffer fb;
 };