Removed MetaEnumVariable to QVariantList converter

This converter is ambigious with the dedicated lookup for this type.
The functionality is not tested, therefore I guess it is not required.
If it is, it should be embedded into the lookupOperator.
Broader QVariant::canConvert usage

* fixes issues with QVariant::fromValue( QObject::children() )
added strip empty line outputstream behavior

* QTextStream does not support seek for the write pointer
* Added Option to disable empty line skipping
* Added dedicated multiline Tests and fixed whitespace tests