build: add the SIBO SDK

code/SIBOSDK/oopdemo/hello.cat

@@ -0,0 +1,19 @@
+IMAGE hello
+
+EXTERNAL olib
+EXTERNAL hwim
+
+INCLUDE hwimman.g
+
+CLASS   hellows   wserv
+window server active object
+    {
+    REPLACE ws_dyn_init
+    }
+
+CLASS   hellobw   bwin
+bordered window
+    {
+    REPLACE wn_init
+    REPLACE wn_draw
+    }