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/state.go

@@ -0,0 +1,52 @@
+package mylog
+
+// The logger state: the one struct every write goes through, how a new one is
+// built, and the two accessors that read and replace it under the package lock.
+// The state itself lives in globals.go with the rest of the package-level
+// variables; this file holds only what a caller does with it.
+
+import (
+	"io"
+	stdlog "log"
+	"os"
+)
+
+// newState builds a state whose stdlib logger writes to dest.
+func newState(lvl Level, dest io.Writer, path string, owned *os.File, closed bool) *state {
+	return &state{
+		level:  lvl,
+		dest:   dest,
+		slog:   newStdLogger(dest),
+		path:   path,
+		owned:  owned,
+		closed: closed,
+	}
+}
+
+// newStdLogger wraps a writer in a standard library logger. Flags are zeroed
+// because the line format is rendered by mylog itself.
+func newStdLogger(dest io.Writer) *stdLogger {
+	l := stdlog.New(dest, "", 0)
+	l.SetFlags(0)
+
+	return l
+}
+
+// getState returns the active logger state.
+func getState() *state {
+	lock.RLock()
+	defer lock.RUnlock()
+
+	return current
+}
+
+// setState replaces the active state wholesale. Tests use it to restore the
+// documented before-Init default.
+func setState(s *state) {
+	lock.Lock()
+	defer lock.Unlock()
+
+	current = s
+}
+
+/* vim: set ft=go noet ai ts=4 sw=4 sts=4: */