Dispatch keyboard events in the Carbon event model

Dispatch keyboard events in the Carbon event model
https://bugs.webkit.org/show_bug.cgi?id=50503

Reviewed by Sam Weinig.

WebKit2:

* Shared/WebEvent.h:
(WebKit::WebKeyboardEvent::macCharCode):
* Shared/WebKeyboardEvent.cpp:
(WebKit::WebKeyboardEvent::WebKeyboardEvent):
(WebKit::WebKeyboardEvent::encode):
(WebKit::WebKeyboardEvent::decode):
Add macCharCode field.

* Shared/mac/WebEventFactory.mm:
(WebKit::WebEventFactory::createWebKeyboardEvent):
* Shared/qt/WebEventFactoryQt.cpp:
(WebKit::WebEventFactory::createWebKeyboardEvent):
* Shared/win/WebEventFactory.cpp:
(WebKit::WebEventFactory::createWebKeyboardEvent):
Pass along the Mac char code.

* WebProcess/Plugins/Netscape/mac/NetscapePluginMac.mm:
(WebKit::NetscapePlugin::platformHandleKeyboardEvent):
Convert the event to a Carobn event.

WebKitLibraries:

Make WKGetNSEventKeyChar available in 32-bit.

* WebKitSystemInterface.h:
* libWebKitSystemInterfaceLeopard.a:
* libWebKitSystemInterfaceSnowLeopard.a:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@73381 268f45cc-cd09-0410-ab3c-d52691b4dbfc