web page embedding of frames

note - this doesn't change the action of build-site.xml in relation to
the resources directory, only cleans up the incorrection description of
what that does and also adds a directory that does what that used to
say. That is,

resources --> site/swingjs/j2s
site-resources --> site/

The problem is that AWT class subclassing may introduce fields that have
the same name as JComponent subclasses, and the transpiler will not
recognize that. One solution would be to privatize all JComponent
subclass fields as $p1 type fields or even just with var.

?j2snocore fix; Frame/JFrame setUndecorated(true) fix