[patch] RFC: Netx plugins

[Francis Kung]

Hi all,

See attached for a patch that changes gcjwebplugin to run applets through 
Netx, consolidating IcedTea "web services" into one place.  An overview 
of the major / possibly contentious changes:

- added an "icedtea-compile" stamp in the makefile for the actual OpenJDK 
build.  This is needed as the new IcedTea is used to build netx (I've 
introduced some API changes, relaxing visibility in sun.applet.*).  Note 
that the lack of "touch stamps/icedtea-compile.stamp" is intentional, to 
remain consistent with current behaviour.

- combined the icedtea-plugin and icedtea-jnlp-launcher patches into one 
file so they apply/revert cleanly

- need to pass --enable-netx-plugin to enable this (considering it an 
experimental feature); all this does is create netx.jar in j2sdk/jre/lib 
with netx code in it.  If this jar is missing, we fall back to using the 
old Sun plugin code (see the reflection bit in the 
sun.applet.PluginAppletViewer constructor).  I'm creating a new netx.jar, 
instead of using j2sdk/lib/tools.jar (like javaws does), so that the 
plugin can be distributed with a JRE rather than requiring the full SDK.

- modified the default security policy to grant all permission to 
${java.home}/lib/netx.jar  (is this safe, or is there a better way to 
accomplish this?)

This isn't complete, but it's finally in a working state and has been in 
a private repo for too long... currently a dialog is displayed for all 
applets asking if the user wants to grant it full permission or not.  The 
plan is to re-use Josh's work on Netx jar-verifying to tweak this dialog 
and only display it when needed; we can also create a consolidated 
JNLP/plugin settings GUI (cache management, trusted certificates, etc).

Comments, or good to commit?

Thanks,
Francis
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