V0.4.6: [updated] added getInstance to ensure a single of NLPEngine runs at any one point of time
V0.4.6: [updated] added flexiAdd feature into CommandWorker. Supports TaskName, TaskDescription, TaskDate, TaskTime, TaskPriority.
V0.4.6: [updated] added NLPLibraries to be loaded on first run and NLPEngine instance to be initialized. Mute all red warnings.