Changes in SuperWaba 1.21

. waba.fx.Graphics:
  . new methods drawRoundRect and fillRoundRect
. changed waba.ui.Button and waba.ui.Window to use the new draw/fillRoundRect
methods.
. new method waba.fx.Image.getPixels. Warning: it works only on PalmOS!
. new method waba.io.ResizeStream.startRecord(int pos)
. new method java.lang.Object.hashCode
. new method java.lang.String.hashCode
. new waba.ui.IKeys.CONTRAST (button interception for it is now available)
. new class waba.util.Hashtable
. changes in waba.applet.Applet
  . now a help is printed when the applet starts, explaining the F1-F12 buttons
usage
  . new