Each edit-generate now declares if it's generally considered safe
(isn't likely to make changes that break on other platforms for e.g.)
Default edits are now used when --edits is omitted.
The match argument now defaults to files with c/cc/cpp extensions when
omitted.
It's now possible to run:
./tools/utils_maintenance/code_clean.py {BUILD_DIR}
Which gives results that can be used with a very low risk of causing
functional changes or breaking other platforms.
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