implemented get_glyph_extents with CFF1

Implemented path operators in a new struct PathProc hooked up to CSOpSet
Added current point to CSInterpEnv
diff --git a/src/hb-ot-face.cc b/src/hb-ot-face.cc
index 388a597..a06e053 100644
--- a/src/hb-ot-face.cc
+++ b/src/hb-ot-face.cc
@@ -28,6 +28,7 @@
 
 #include "hb-ot-cmap-table.hh"
 #include "hb-ot-glyf-table.hh"
+#include "hb-ot-cff1-table.hh"
 #include "hb-ot-hmtx-table.hh"
 #include "hb-ot-kern-table.hh"
 #include "hb-ot-post-table.hh"