[P104] Improve storing settings (speed and size)

[tonhuisman]

Features:

• Implement Extended CustomTaskSettings storage to improve speed of saving when on ESP32 with LittleFS storage by skipping to the Extended storage right after saving the version marker
• Reduce the number of low-level Save calls by combining the size and data in a single data-block to save
• Implement toStringNoZero() to reduce the size of settings to store

TODO:

• Testing