Hide console on windows

The companion does no longer show a terminal window pop up

cmd/companion/commands_windows.go

@@ -0,0 +1,18 @@
+package main
+
+import (
+	"os/exec"
+	"syscall"
+)
+
+// This is the windows CREATE_NO_WINDOW syscall.
+// We have no golang.org/x/sys dependency, so this will suffice
+const createNoWindow = 0x08000000
+
+// Allows running commands without showing a terminal window on startup on windows
+func hideConsole(cmd *exec.Cmd) {
+	cmd.SysProcAttr = &syscall.SysProcAttr{
+		HideWindow: true,
+		CreationFlags: createNoWindow,
+	}
+}