[rfc] [icedtea-web] Fix EDT hanging on OpenJDK 11

[Laurent Bourgès]

Hi,

Here is my first patch against iceadtea-web-1.7 repository.

Build providing the patched netx.jar:
http://jmmc.fr/~bourgesl/itw/

Changelog:
- tested on OpenJDK11-EA (linux) / win / mac
- added Swingutils to provide several EDT violation checks and a new
ThreadPool to dispatch swing events through the Main AppContext (and avoid
AWT deadlocks)
- added lots of debugging in Dialog creation
- fix lots of EDT violations

Best regards,
Laurent
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