Hotkeys: Add "Toggle On-Screen Display"

[stenzek]

Description of Changes

Toggles whatever's enabled on and off.

Rationale behind Changes

Closes #9683.

Suggested Testing Steps

Test new hotkey.

[bigol83]

Just checked it and it works great, It applies to general OSD settings and even game profile OSD settings. Tried with DS4 assigning toggle to touchpad, it's really cool right now.

One minor error though: when i extracted the build and clicked on pcsx2.clang to run setup wizard i had this issue

Since my language is set to System language (Italian), i don't know if it's something specific to Italian language or to any other translated languages.

Anyway, after i click OK, setup works as expected even in Italian language and there are no other errors using the emulator.

[stenzek]

One minor error though: when i extracted the build and clicked on pcsx2.clang to run setup wizard i had this issue

That'll happen if you use the MSBuild binaries, not the CMake binaries. MSBuild doesn't merge the base translation modules into one file. Been on my todo list for a while, but because we only distribute CMake builds as releases, it's kinda a non-issue.