We don't know whether the V8Js object dtor or the script (resource)
dtor is called first. Nevertheless they depend on each other as
we must not simply Reset the persistent v8::Script if the v8::Isolate
was disposed before.
Now the V8Js dtor iterates over all script resources and resets the
persistent v8::Script instances; leaving an invalidated resource
object (which cannot be called anymore).
Splits longish v8js.cc file into pieces. It used to contain the
definitions of all V8Js exception classes, the V8Js class itself as
well as the V8Object/V8Function classes... besides the module setup
code itself.
This change factors out all exception class definitions into a
seperate pair of files (v8js_exceptions.*).
The V8Js class definition itself is moved to v8js_class.* pair,
with the v8 init & call code moved to v8js_v8.* pair
and the watchdog timer to v8js_timer.* pair.
The V8Object/V8Function code was moved to v8js_v8object_class.*
pair, not differentiating between the two like before.
