Regex support for missing predefined character classes and negated character classes

[lmasroca]

Added Java/JS support for negated character classes
Added Java support for missing predefined character classes escapes (\v, \H, etc.) and POSIX character classes (\p{Lower}, etc.)

[lmasroca]

Looking into this failing check, the test generates a SqlCompositeGene which contains a ChoiceGene which contains an ArrayGene which starts empty but its template contains SqlForeignKeyGene. This generates no problems as long as the array is empty, but as soon as the array gets a random element everything stops being globally valid (in this case the new element, SqlForeignKeyGene is not globally valid as none of its parents in the chain are an SqlAction). The test filters globally invalid genes before randomizing but not after.

This happens on GeneRandomizedTest during verifyCopyValueFrom. We could add a globally valid check after randomization the same way it is done with printable checks, this makes the test pass. However, I am not sure if there should be checks in place to make this chain invalid even before randomizing instead.

    private fun verifyCopyValueFrom(
        mutable: List<Gene>,
        rand: Randomness
    ) {
        val printable = mutable.filter { it.isGloballyValid() && it.isPrintable() }

        printable.forEach { root ->

            val x = root.copy()
            val sx = x.getValueAsRawString()

            val y = x.copy().apply { randomize(rand, true) }
            if(!y.isPrintable()){ // we could add a globally valid check here the same way we filter before
                return@forEach
            }
            val sy = y.getValueAsRawString()