Reduce the amount of copying in the mainloop. We copy tag/arg only, if we
need to preserve them for a new loop iteration (after we leave mainloop).
Otherwise, we can just let them point to th

Reduce the amount of copying in the mainloop. We copy tag/arg only, if we
need to preserve them for a new loop iteration (after we leave mainloop).
Otherwise, we can just let them point to the work area.

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Revert part of last commit. I'll refine it later.

Another speedup by avoiding string copies.

15% speed gain in test case (rewriting 1M URLs).

Remove nextiter label

s/DEBUG/SCANNER_DEBUG/. "Convert" one macro to inline function to be more
consistent. Also use continue.

Fix a few build bugs, still no go

Add new URL scanner. This version is up to 20% faster. It will be
enabled by default once I'm sure that it works in every case.

To enable it, apply s/url_adapt_ext/url_adapt_ext_ex/ to s

Add new URL scanner. This version is up to 20% faster. It will be
enabled by default once I'm sure that it works in every case.

To enable it, apply s/url_adapt_ext/url_adapt_ext_ex/ to session.c

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