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/remotelog/remotelog.go

@@ -63,7 +63,7 @@ type Params struct {
 	// must chain to (SWW_WAF_LOG_REMOTE_TLS_CA_FILE), nil for the host's.
 	RootCAs *x509.CertPool
 	// Buffer is the most lines held while they wait to be sent
-	// (SWW_WAF_LOG_REMOTE_BUFFER).
+	// (SWW_WAF_LOG_REMOTE_BUFFER_LINES).
 	Buffer int
 	// Facility is the number of the records' syslog facility
 	// (SWW_WAF_LOG_REMOTE_FACILITY), and AppName their APP-NAME