Better modularize clipboard code (add "clip" package; break up TOTP code

clip/launchClipClearProcessGUIUNIX.go

@@ -0,0 +1,16 @@
+//go:build !windows && !darwin && !android && !ios && !termux && !wsl && interactive
+
+package clip
+
+import (
+	"os"
+	"strconv"
+)
+
+// LaunchClipClearProcess launches the timed clipboard clearing process.
+// For interactive GUI/TUI implementations, the clipboard clearing process is launched as a goroutine.
+// copySubject can be omitted to clear the clipboard immediately and unconditionally.
+func LaunchClipClearProcess(copySubject string, isWayland bool) {
+	os.Args = []string{os.Args[0], "", strconv.FormatBool(isWayland)}
+	go clipClearProcess(copySubject)
+}