fix: dangling seq next
-adapted grammar and added optional 'endseq' for 'seq' .. 'next' to prevent dangling 'seq' .. 'next' problem

Signed-off-by: marcel.dausend <marcel.dausend@uni-ulm.de>
fix: test(-rsc) package names

Signed-off-by: marcel.dausend <marcel.dausend@uni-ulm.de>
added test cases

Signed-off-by: marcel.dausend <marcel.dausend@uni-ulm.de>