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/types.go

@@ -0,0 +1,43 @@
+package mylog
+
+// Types only. The level constants, the name table and Level.name live in
+// globals.go and level.go respectively, because a file named "types" must hold
+// nothing that is not a type.
+
+import (
+	"io"
+	stdlog "log"
+	"os"
+)
+
+// Level is the severity of a log message. Levels are ordered, and a message is
+// written when its own level is at or above the configured level.
+type Level int
+
+// stdLogger is the standard library logger doing the actual writing.
+type stdLogger = stdlog.Logger
+
+// Logger is the interface for modules that would otherwise depend on the
+// standard library's *log.Logger. It is deliberately the smallest method set
+// that *log.Logger satisfies, so widening a module's parameter type from
+// *log.Logger to Logger keeps existing callers compiling.
+type Logger interface {
+	Output(calldepth int, s string) error
+}
+
+// adapter is the Logger handed to such modules. Messages arrive through
+// Output and are logged at debug level into the already-open destination.
+type adapter struct{}
+
+// state is everything the logger needs to write a line. It is held behind a
+// lock so that a concurrent Init cannot close a destination mid-write.
+type state struct {
+	level  Level
+	dest   io.Writer
+	slog   *stdLogger
+	path   string
+	owned  *os.File
+	closed bool
+}
+
+/* vim: set ft=go noet ai ts=4 sw=4 sts=4: */