Finish windows support

- Fix service creation
- Singleton lock
- Control error/logging
- Revamp run/service interaction
- Add option to turn off stdout/stderr output (for Windows Service)
- Use log instead of fmt.Print*

pmctl/service.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+	"sync"
+)
+
+var (
+	startupComplete   = make(chan struct{}) // signal that the start procedure completed (is never closed, just signaled once)
+	shuttingDown      = make(chan struct{}) // signal that we are shutting down (will be closed, may not be closed directly, use initiateShutdown)
+	shutdownInitiated = false               // not to be used directly
+	shutdownError     error                 // may not be read or written to directly
+	shutdownLock      sync.Mutex
+)
+
+func initiateShutdown(err error) {
+	shutdownLock.Lock()
+	defer shutdownLock.Unlock()
+
+	if !shutdownInitiated {
+		shutdownInitiated = true
+		shutdownError = err
+		close(shuttingDown)
+	}
+}
+
+func getShutdownError() error {
+	shutdownLock.Lock()
+	defer shutdownLock.Unlock()
+
+	return shutdownError
+}