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/nextcloud.conf

@@ -5,7 +5,7 @@
 # switches off, so this 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 JSON 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. Nextcloud's pages are matched
+# while SWW_WAF_CORE_RULE_SET_BODY_INSPECTION_SIZE is set. Nextcloud's pages are matched
 # at the site root and under /index.php/, where a Nextcloud without pretty URLs
 # serves them.
 #