[build] Add dependencies as submodules

Do not use mason and build offline. These are
header only deps.

.gitmodules

@@ -4,3 +4,57 @@
 [submodule "platform/ios/vendor/mapbox-events-ios"]
 	path = platform/ios/vendor/mapbox-events-ios
 	url = https://github.com/mapbox/mapbox-events-ios.git
+[submodule "vendor/nunicode"]
+	path = vendor/nunicode
+	url = https://bitbucket.org/alekseyt/nunicode.git
+[submodule "vendor/rapidjson"]
+	path = vendor/rapidjson
+	url = https://github.com/Tencent/rapidjson.git
+[submodule "vendor/earcut.hpp"]
+	path = vendor/earcut.hpp
+	url = https://github.com/mapbox/earcut.hpp.git
+[submodule "vendor/geojson-vt-cpp"]
+	path = vendor/geojson-vt-cpp
+	url = https://github.com/mapbox/geojson-vt-cpp.git
+[submodule "vendor/geojson.hpp"]
+	path = vendor/geojson.hpp
+	url = https://github.com/mapbox/geojson.hpp.git
+[submodule "vendor/geometry.hpp"]
+	path = vendor/geometry.hpp
+	url = https://github.com/mapbox/geometry.hpp.git
+[submodule "vendor/polylabel"]
+	path = vendor/polylabel
+	url = https://github.com/mapbox/polylabel.git
+[submodule "vendor/protozero"]
+	path = vendor/protozero
+	url = https://github.com/mapbox/protozero.git
+[submodule "vendor/shelf-pack-cpp"]
+	path = vendor/shelf-pack-cpp
+	url = https://github.com/mapbox/shelf-pack-cpp.git
+[submodule "vendor/supercluster.hpp"]
+	path = vendor/supercluster.hpp
+	url = https://github.com/mapbox/supercluster.hpp.git
+[submodule "vendor/variant"]
+	path = vendor/variant
+	url = https://github.com/mapbox/variant.git
+[submodule "vendor/vector-tile"]
+	path = vendor/vector-tile
+	url = https://github.com/mapbox/vector-tile.git
+[submodule "vendor/wagyu"]
+	path = vendor/wagyu
+	url = https://github.com/mapbox/wagyu.git
+[submodule "vendor/expected-lite"]
+	path = vendor/expected
+	url = https://github.com/martinmoene/expected-lite.git
+[submodule "vendor/kdbush.hpp"]
+	path = vendor/kdbush.hpp
+	url = https://github.com/mourner/kdbush.hpp.git
+[submodule "vendor/unique_resource"]
+	path = vendor/unique_resource
+	url = https://github.com/okdshin/unique_resource.git
+[submodule "vendor/icu"]
+	path = vendor/icu
+	url = https://github.com/unicode-org/icu.git
+[submodule "vendor/optional"]
+	path = vendor/optional
+	url = https://github.com/mapbox/Optional.git