Implements changes required by #19

[numeredev]

SUMMARY

Implements necessary changes for #19

Reviewers: @numere-org/maintainers

IMPLEMENTATION

• Implementation: Created the leave command as described by the issue analysis. Registered the command also as context-specific.
• Implementation test: Created a nested loop structure with a counter and used leave to jump out of both loops at the same time.

DOCUMENTATION

• [x] ChangesLog updated
• [x] Code changes commented
• Documentation articles:
  • [x] corresponding documentation articles updated
  • [ ] new documentation articles created
  • [ ] not needed
• Language files:
  • [x] corresponding language files updated
  • [ ] not needed

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TESTS BY REVIEWERS

• [x] Added to the automatic SW tests
• [x] Tested manually

[raphael-sys]

@numeredev Please verify that the test (that I linked with the issue) is sufficient for now. If not, let me know what to add.