Merge branch 'web-request'

Add wxWebViewRequest and related classes allowing to use HTTPS and
HTTP/2.

See https://github.com/wxWidgets/wxWidgets/pull/977

build/cmake/tests/base/CMakeLists.txt

@@ -52,6 +52,7 @@ set(TEST_SRC
     misc/typeinfotest.cpp
     net/ipc.cpp
     net/socket.cpp
+    net/webrequest.cpp
     regex/regextest.cpp
     regex/wxregextest.cpp
     scopeguard/scopeguardtest.cpp