Merge branch 'font-fixes'

Complete support for fractional point sizes and font weights other than
light/bold.

Also harmonize wxFont API and implementation among all ports (fixing
compilation of those of them that were broken by recent changes).

See https://github.com/wxWidgets/wxWidgets/pull/919

samples/caret/caret.cpp

@@ -337,8 +337,7 @@ void MyCanvas::CreateCaret()
 
 void MyCanvas::SetFontSize(int fontSize)
 {
-    m_font = wxFont(fontSize, wxFONTFAMILY_TELETYPE,
-                    wxFONTSTYLE_NORMAL, wxFONTWEIGHT_NORMAL);
+    m_font = wxFont(wxFontInfo(fontSize).Family(wxFONTFAMILY_TELETYPE));
 
     wxClientDC dc(this);
     dc.SetFont(m_font);