[rfc][icedtea-web] Fix wrongly placed object construction helpers in IcedTeaScriptablePluginObject

[Adam Domurad]

Whoever wrote these static helpers switched up which class they are 
associated with -- it took me a while of being confused to notice it, 
too. This patch places the object creation helper methods in the right 
class.
I added some more type safety too to prevent future confusion.

No changelog yet, I'll wait for an ack on the patch first.

Cheers,
-Adam
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