Global code ovehaul - remove CAS and other, add 15 minute greet check

- Remove CAS, as it no longer works for us
- Remove other checks
- Implement 15 minute greet timeout check
- Fix chat logos
- Ditch thirdparty logger, use stdlib log facility wrapper for logging

internal/mylog/write.go

@@ -0,0 +1,28 @@
+package mylog
+
+// The one-line emit path: decide whether the line is wanted, render it, write
+// it. Everything else in the package exists to reach these two functions.
+
+import "time"
+
+// write renders and writes one line if the level passes the filter and the
+// logger is open. The read lock is held across the write so that a concurrent
+// Init cannot close the destination underneath us.
+func write(lvl Level, msg string) {
+	lock.RLock()
+	defer lock.RUnlock()
+
+	if current.closed || lvl < current.level {
+		return
+	}
+
+	_ = current.slog.Output(calldepth, render(lvl, msg))
+}
+
+// render builds one log line: a GMT+0 timestamp, the uppercase level, and the
+// message verbatim, separated by exactly one space each.
+func render(lvl Level, msg string) string {
+	return time.Now().UTC().Format(stampLayout) + " " + lvl.name() + " " + msg
+}
+
+/* vim: set ft=go noet ai ts=4 sw=4 sts=4: */