build: Use environment var 'PLUGIN_JAR' and property 'plugin.jar' to define plugin.jar for JavaScript bridge; Use javac debug defaults: source,lines.
Add Applet Feature incl. required fixes.

- Jake2Applet
  - Reenable JavaScript Bridge to resize Applet
  - Pass through 4:3 aspect custom video mode (Jake2 args)
  - Pass through applet parameter 'jake_args' (Jake2 args)
  - OSX Hack: Re-create Game at init, otherwise flickering appears (??)

- Fix VID.init: Set vid_ref.modifier = true, otherwise not guaranteed VID creation

- BeginFrame, R_BeginFrame, beginFrame, activateGLContext:
  Return 'true', if ctx is available, otherwise false to skip frame.

- NEWTWin:
  - Applet mode (in Applet container): Always release GL ctx

  - Use GLAnimatorControl impl, to state whether we are animating or not
    and to tell us, whether we have to release the GL ctx.

  - Add HOME -> Reparent feature for Applets
    - Workaround for NEWT/Windows Bug 798

- NEWT Key Handling:
  - Ignore auto-repeat
  - Workaround for NEWT/Windows Bug 798

- Add HTML page
  - normal
  - debug mode
Bump jogamp to 2.0.2
Remove workaround for Bug 798
build.xml: ant get latest jogamp release & enable builds using icedtea-web.

Signed-off-by: Xerxes Rånby <xerxes@zafena.se>