[rfc][icedtea-web] refactored logging for plugin

[Jiri Vanek]

Hi!

This is adding possibility to configure plugin debug via itw-settings, is getting rid of uncontrolled print outs, and add java-like headers (if enabled)
Please, do  not look  on duplicated code in PLUGIN_{error,debug} macros, I will get rid of it when I will do  enty points for file log and system log.

I have intentionally ignored way to force plugin debug via -verbose sent via itw-settings jvm parameters. Imho it will be missus.

J.
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