Rewrite Save Data & Impl Save Data Dialog (#824)

* core: Rewrite PSF parser & add encoder

add .sfo hex pattern to /scripts

* core/fs: allow to mount path as read-only

* common: Add CString wrapper to handle native null-terminated strings

* SaveData: rewrite to implement full functionality

* mock value for SYSTEM_VER

* SavaData: backup features

* SavaData: SaveDataMemory features

* imgui Ref-counted textures

- has a background thread to decode textures

* imgui: rework gamepad navigation

* PSF: fixed psf not using enum class for PSFEntryFmt (was a standard old ugly enum)

- Add null check to CString when itself is used in a nullable field

* SaveDataDialog implementation

- Fix Mounting/Unmounting check of SaveInstance

src/video_core/renderer_vulkan/vk_scheduler.cpp

@@ -4,6 +4,7 @@
 #include <mutex>
 #include "common/assert.h"
 #include "common/debug.h"
+#include "imgui/renderer/texture_manager.h"
 #include "video_core/renderer_vulkan/vk_instance.h"
 #include "video_core/renderer_vulkan/vk_scheduler.h"
 
@@ -190,6 +191,7 @@ void Scheduler::SubmitExecution(SubmitInfo& info) {
     };
 
     try {
+        ImGui::Core::TextureManager::Submit();
         instance.GetGraphicsQueue().submit(submit_info, info.fence);
     } catch (vk::DeviceLostError& err) {
         UNREACHABLE_MSG("Device lost during submit: {}", err.what());