Update checker. (#251)

* 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 <34012267+hyperbx@users.noreply.github.com>

vcpkg.json

@@ -10,6 +10,7 @@
             "platform": "windows"
         },
         "directx-dxc",
-        "freetype"
+        "freetype",
+        "curl"
     ]
 }