#enrichment

• Allow escaped newlines in more places, according to POSIX specifications. For example, make users may want to use multiline rule prerequisite lists, when managing long .PHONY or .IGNORE sequences.
• References to "policy" have been simplified to "check" for scanning operations and "message" for reported descriptions.
• Additional linter checks implemented.
• Existing checks refined. For example, UB_LATE_POSIX_MARKER now triggers when *.include.mk files feature the .POSIX: strict special target.
• Minor consistency improvement to the rendered warning message format.
• Add further illustrative examples, clarification, and minor grammatical enhancements to documentation.
• Refactor code layout for maintainability.