* Update checker.
* Fix build and enum class.
* Get rid of submodule for httplib.
* Get rid of submodule for curl.
* Minor style changes and fix video.cpp Linux build error.
* CTitleStateIntro_patches: implemented update message
* Update update_checker.cpp
* CTitleStateIntro_patches: fix fade out accepting input
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Co-authored-by: Hyper <[email protected]>
