Add Length/Update expressions for arrays

Signed-off-by: Christoph Höger <christoph.hoeger@tu-berlin.de>
Fix lexing keywords

Signed-off-by: Christoph Höger <christoph.hoeger@tu-berlin.de>
Fix UTF8 error position creation

Signed-off-by: Christoph Höger <christoph.hoeger@tu-berlin.de>
Extended parser for 'complex' example

Signed-off-by: Christoph Höger <christoph.hoeger@tu-berlin.de>