ShebangIssueTracker implements the rule that scripts must be executable if
and only if they have a shebang line. By removing PermissionIssueTracker, we
now allow files with any extension to be executable (provided they have a
shebang line), and allow *.sh and *.pl to be non-executable modules if they
don't have a shebang line (as was already the case for *.py).
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
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