Merge branch 'web-request'

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

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

docs/doxygen/mainpages/const_wxusedef.h

@@ -90,6 +90,7 @@ library:
 @itemdef{wxUSE_CONSOLE_EVENTLOOP, Enable event loop in console programs.}
 @itemdef{wxUSE_CONSTRAINTS, Use wxLayoutConstraints}
 @itemdef{wxUSE_CONTROLS, If set to 0, no classes deriving from wxControl can be used.}
+@itemdef{wxUSE_CREDENTIALDLG, If set to 0, disabled wxCredentialEntryDialog used by wxWebRequest.}
 @itemdef{wxUSE_DATAOBJ, Use wxDataObject and related classes.}
 @itemdef{wxUSE_DATAVIEWCTRL, Use wxDataViewCtrl class.}
 @itemdef{wxUSE_DATEPICKCTRL, Use wxDatePickerCtrl class.}
@@ -254,6 +255,7 @@ library:
 @itemdef{wxUSE_URL_NATIVE, Use native support for some operations with wxURL.}
 @itemdef{wxUSE_VALIDATORS, Use wxValidator class.}
 @itemdef{wxUSE_VARIANT, Use wxVariant class.}
+@itemdef{wxUSE_WEBREQUEST, Use wxWebRequest class.}
 @itemdef{wxUSE_WEBVIEW, Use wxWebView class.}
 @itemdef{wxUSE_WIZARDDLG, Use wxWizard class.}
 @itemdef{wxUSE_WXHTML_HELP, Use wxHtmlHelpController and related classes.}

docs/doxygen/overviews/commondialogs.h

@@ -214,6 +214,16 @@ is obtained using wxNumberEntryDialog::GetValue().
 
 
 
+@section overview_cmndlg_cred wxCredentialEntryDialog Overview
+
+Classes: wxCredentialEntryDialog
+
+This is a dialog with user and password entry fields. The values that the
+user entered are obtained using wxCredentialEntryDialog::GetUser() and
+wxCredentialEntryDialog::GetPassword().
+
+
+
 @section overview_cmndlg_msg wxMessageDialog Overview
 
 Classes: wxMessageDialog

docs/doxygen/overviews/envvars.h

@@ -26,5 +26,11 @@ wxWidgets programs.
         @c /usr/local or @c /usr). You can set WXPREFIX if you are for example
         distributing a binary version of an application and you don't know in advance
         where it will be installed.}
+@itemdef{WXWEBREQUEST_BACKEND,
+         This variable can be set to override the choice of the default backend
+         used by wxWebRequest, see wxWebSession::New(). Most common use is to
+         set it to @c "CURL" to force using libcurl-based implementation under
+         MSW or macOS platforms where the native implementation would be chosen
+         by default.}
 */