[rfc][icedtea-web] Make 'getvalue' nonblocking to reduce hanging chance & improve responsivity

[Adam Domurad]

Hi all. I am very happy to present this patch!

All Firefox hanging bugs had a common theme, Firefox waits for the 
result of some function to finish from the plugin, and IcedTea-Web 
plugin-side waits as well for the java-side.

This patch should reduce the chance of Firefox outright hanging, by 
making the most frequent site of these occurences nonblocking. This will 
also improve responsivity, eg Firefox no longer 'hangs' while waiting 
for you to accept or deny a confirmation message.

The patch delays waiting for initialization of the applet until its 
absolutely needed - which is only when the applet is communicated with 
using liveconnect.

This especially benefits the majority of applets that do not use 
liveconnect. Eg the applets at 
http://www.walter-fendt.de/ph14e/resultant.htm no longer presents a 
blank page for a while, for me.

The patch introduces (with tests) a helper class, NPObjectRef. This was 
done to make this patch easier to reason about. It should be far easier 
to know now when to retain/release an object (almost always automatic, 
only call raw_retain() when returning raw NPObject* to browser).

It also introduces a wrapper around g_strdup_printf with a (very) simple 
test.

I have done testing on the patch and it looks OK, but I will still test 
it more.

Cheers,
-Adam
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