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/moon/signals_windows.go

@@ -0,0 +1,22 @@
+//go:build windows
+
+package moon
+
+import "os"
+
+// terminationSignals are the signals that ask the bot to shut down.
+func terminationSignals() []os.Signal {
+	return []os.Signal{os.Interrupt}
+}
+
+// reopenSignals is empty on Windows.
+//
+// SIGHUP and SIGUSR1 are Unix signals that Windows never delivers — SIGUSR1 does
+// not even exist in the syscall package there — so there is nothing to re-open
+// the log for. The empty set keeps handleSignal platform-agnostic: a Windows
+// service restarts to rotate its logs instead of signalling.
+func reopenSignals() []os.Signal {
+	return nil
+}
+
+/* vim: set ft=go noet ai ts=4 sw=4 sts=4: */