Change ClassicSolverFactory runtime libraries and :gui Application issue

[fmuratori]

Platform:
This behaviour appears on a Kotlin/JS application.

How to reproduce the bug:
Here's the demo code for reproducing the bug:

// create a new SolverFactory with additional library IOLib
private val customSolverFactory: SolverFactory = ClassicSolverFactory
    .newBuilder()
    .withLibrary(IOLib) // open issue
    .toFactory()

// add new custom factory to :gui controller
var application: Application =
    TuPrologApplication.of(
        DefaultJsRunner(),
        customSolverFactory,
        Page.DEFAULT_TIMEOUT
    )

// create a new page (should use the custom factory)
application.newPage()

// handle page creation 
application.onPageCreated.bind { it:Event<Page> ->
  // problem here
  // page.solverBuilder doesn't have IOLib as a runtime library
}

Expected behaviour:
The solverBuilder of a newly created Page instance should also use IOLib as a runtime library

Workaround:
Add the library to the Page.solverBuilder instance as soon as the page is created

application.onPageCreated.bind { it:Event<Page> ->
  it.event.solverBuilder.withLibrary(IOLib)
}