IndentationInfo.apply_relative_indents: new parameter treat_unprefixe…

…d_line_as_relative

IndentationInfo.apply_relative_indents

Improved handling of lines without the relative indent prefix (@n:);
Fixes 'apply-relative-indents' test.

CST-based indentation discovery

indentation_kit.py: prefer CST-based indentation discovery. Fall back to text-based discovery if unavailable.
Passes indentation tests for codeeditor.py

test_corpus.py: Add test for indentation

_matches_when: consistently use stripped comparisons

fix: bug in 'segment_to_search_range' when end_relpos.marker_subtype …

…== 'number'

cedarscript-ast-parser>=0.5.1

Prevent bug related to even number of characters in an intra-command …

…comment

ed script tests pass

feat: Add case_filter.py with CaseStatement and processing logic