Implement wxFont::GetFaceName() to return the face name being really used.

Implement wxFont::GetFaceName() to return the face name being really used.

Since the change of r60391 empty face name was returned for all fonts created
using the standard wxFont constructor (so basically all fonts except for those
created from native font info and the default/normal font which we retrieve
from the system). Use Windows GetOutlineTextMetrics() function to get the real
face name being used independently of the way the font was created.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@62675 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775