Fix drawing glitches

- Use standard ASCII characters for window borders
- Fix color palette
- Fix "reverse" attribute emulation by having dedicated palette entries
- Fix usage of attr ram
diff --git a/contiki-vsmile/conf/ctk-conio-conf.h b/contiki-vsmile/conf/ctk-conio-conf.h
index f0fa209..da43c86 100644
--- a/contiki-vsmile/conf/ctk-conio-conf.h
+++ b/contiki-vsmile/conf/ctk-conio-conf.h
@@ -45,13 +45,13 @@
 #define BACKGROUNDCOLOR     1
 
 #define WINDOWCOLOR_FOCUS   5
-#define WINDOWCOLOR         8
+#define WINDOWCOLOR         2
 
 #define DIALOGCOLOR         5
 
 #define WIDGETCOLOR_HLINK   6
 #define WIDGETCOLOR_FWIN    5
-#define WIDGETCOLOR         8
+#define WIDGETCOLOR         2
 #define WIDGETCOLOR_DIALOG  5
 #define WIDGETCOLOR_FOCUS   7