tor/changes/smartlist_foreach

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o Code simplification and refactoring:
- Do not use SMARTLIST_FOREACH for any loop whose body exceeds
10 lines. Doing so in the past has led to hard-to-debug code.
The new style is to use the SMARTLIST_FOREACH_{BEGIN,END} pair.
Issue 6400.
- Do not nest SMARTLIST_FOREACH blocks within one another. Any
nested block ought to be using SMARTLIST_FOREACH_{BEGIN,END}.
Issue 6400.