Generate correct events for extended keys in wxMSW wxUIActionSimulator.

Generate correct events for extended keys in wxMSW wxUIActionSimulator.

Simulating keys such as WXK_END resulted in WXK_NUMPAD_END event being
generated instead of the expected WXK_END one.

Fix this by returning from wxCharCodeWXToMSW() whether the key code is a
normal or extended one and use this to set KEYEVENTF_EXTENDEDKEY in
wxUIActionSimulator::DoKey().

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@65518 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775