Rename the settings whose names do not say what they control (closes #234)

Applies the setting renames of the naming audit under the SWW_WAF_ and
SWW_RPROXY_ prefixes, with sneak's names for the IP reputation cache
time and the two time limits, which now take milliseconds. The rproxy
log field default_disposition becomes waf_backend_no_answer, and
config.Config and config.FromEnvironment become config.WAF and
config.WAFFromEnvironment. Go fields, test names and prose follow. No
aliases; nothing reads the old names.

Model: opus-5-5

internal/coreruleset/mastodon.conf

@@ -5,7 +5,7 @@
 # file is loaded before the Core Rule Set's rules. Each comment names a request
 # a rule refused. An exclusion on a field of a body applies only when the query
 # has no parameter of that name, so it matters only while
-# SWW_WAF_CORE_RULE_SET_BODY_LIMIT is set.
+# SWW_WAF_CORE_RULE_SET_BODY_INSPECTION_SIZE is set.
 #
 # Gitea serves /api/v1/ too, and Drupal serves /admin/. So only Mastodon's own
 # resources under them count as Mastodon's paths.