Dependency update
Removed statement mutation
Added asserts to dynmap
Partially complete checked-labels
Moved token_current_spel() to tokenise.c
Expand out label and break/continue/goto code gen
Changed goto + label logic and label tokenisation

Labels coherence is checked and labels are tokenise without parsing
expressions
Usage checks on labels
Added __attribute__((unused)) for labels
Merge branch 'feature/checked-labels'