Maint: rework publicip package

- Use loopstate package
- Loop interface composition
- Return concrete struct from constructors
- Split into more files
- Add publicip/state package

internal/publicip/status.go

@@ -0,0 +1,16 @@
+package publicip
+
+import (
+	"context"
+
+	"github.com/qdm12/gluetun/internal/models"
+)
+
+func (l *Loop) GetStatus() (status models.LoopStatus) {
+	return l.statusManager.GetStatus()
+}
+
+func (l *Loop) ApplyStatus(ctx context.Context, status models.LoopStatus) (
+	outcome string, err error) {
+	return l.statusManager.ApplyStatus(ctx, status)
+}