Fix Array support for Vss models

[Chrylo]

Describe the bug
All generated Vss models with an array data type are not properly supported currently. The .toString() does not return a proper string which can be parsed to a Datapoint.

To Reproduce
Steps to reproduce the behavior:

1. Select Vss Model SeatPosCount in the TestApp (Vss mode)
2. Input "2,4" without (")

Expected behavior

• The VssModel is correctly updated
• "ANDROID_AUTO, APPLE_CARPLAY" (with a space after the comma) should also work

Screenshot

Additional context
A good solution could be to generate a "stringValue" method for all VssSignals. Because we have to know the exact array type e.g. IntArray / Doublearray / Array for the correct cast.