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Implement proposal 318: Limit protovers to 0..63

In brief: we go through a lot of gymnastics to handle huge protover
numbers, but after years of development we're not even close to 10
for any of our current versions.  We also have a convenient
workaround available in case we ever run out of protocols: if (for
example) we someday need Link=64, we can just add Link2=0 or
something.

This patch is a minimal patch to change tor's behavior; it doesn't
take advantage of the new restrictions.

Implements #40133 and proposal 318.
7 jobs for prop318_limit_protover_035 in 35 minutes and 17 seconds (queued for 33 minutes and 55 seconds)
latest
Status Job ID Name Coverage
  Test
passed #3745
debian-disable-dirauth

00:07:41

passed #3742
debian-distcheck

00:06:10

passed #3743
debian-docs

00:03:25

passed #3741
debian-hardened

00:12:19

passed #3744
debian-integration

00:16:45

passed #3740
debian-minimal

00:04:57

passed #3746
debian-nss

00:07:44