build: add the SIBO SDK

code/SIBOSDK/ewdemo/ehello.cat

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+IMAGE ehello
+
+EXTERNAL olib
+EXTERNAL hwim
+
+INCLUDE hwimman.g
+INCLUDE edwin.g
+
+CLASS ehwserv wserv
+    {
+    REPLACE ws_dyn_init
+    }
+
+CLASS ehbwin bwin
+    {
+    REPLACE wn_init
+    REPLACE wn_emphasise
+    REPLACE wn_key
+    REPLACE wn_draw
+    PROPERTY
+        {
+        PR_EDWIN *edwin;
+        }
+    }
+
+CLASS ehdlg dlgbox
+    {
+    REPLACE dl_dyn_init
+    }