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/forgejo.conf

@@ -132,7 +132,7 @@ SecRule REQUEST_FILENAME "@streq /admin/repos" \
 # They skip these rules:
 #   932120: fix-powershell-module
 #   932260: feat/docker-support
-# They are read only while SWW_WAF_CORE_RULE_SET_BODY_LIMIT is set, and skip
+# They are read only while SWW_WAF_CORE_RULE_SET_BODY_INSPECTION_SIZE is set, and skip
 # nothing when the query has a parameter of the same name.
 SecRule REQUEST_FILENAME "@rx ^/[^/]+/[^/]+/settings/rename_branch$" \
     "id:900666,phase:1,pass,nolog,chain"