ThorNotes v0.4.1

• Refactored screen capture logic, on Thor firmware we need to reuse VirtualDisplay since rapidly creating and destroying them has chance to freeze machine. Additionally enforced timeout to avoid creating too much screenshot at once; allowed screenshot mechanism to detect a stuck screenshot attempt and fail it but it shouldn't be triggered too much
• Serialized some write / mutational methods for extra safety
• OCR feature uses sampled decode instead of full-size bitmap decode