yuzu-qt: Attempt to workaround broken Vulkan installations

This does a few things in order to make the default setting Vulkan
workable.

- When yuzu boots, it just opens the Vulkan library.
  - If it works, all good and we continue with Vulkan as the default.
  - If something breaks, a new file in the config directory will be left
    behind (this is deleted normally).
- If Vulkan is not working, has_broken_vulkan is set to true.
  - The first time this happens, a warning is displayed to notify the
    user.
  - This forces use of OpenGL, and Vulkan cannot be selected.
  - The Shader Backend selector is made accessible for use in custom
    configurations.
  - To disable has_broken_vulkan, the user needs to press a button in
    Graphics Configuration to manually run the Vulkan device
    enumeration.

src/yuzu/uisettings.h

@@ -77,6 +77,7 @@ struct Values {
     Settings::BasicSetting<bool> pause_when_in_background{false, "pauseWhenInBackground"};
     Settings::BasicSetting<bool> mute_when_in_background{false, "muteWhenInBackground"};
     Settings::BasicSetting<bool> hide_mouse{true, "hideInactiveMouse"};
+    Settings::BasicSetting<bool> has_broken_vulkan{false, "has_broken_vulkan"};
 
     Settings::BasicSetting<bool> select_user_on_boot{false, "select_user_on_boot"};