Signal level notification

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- 1.0.6. Fixed a "no signal" indicator.
- 1.0.5. Display WiFi signal strength in units of dbm, when WiFi monitor enabled.
- 1.0.5. Fixed a bug that causes crashes.
- 1.0.4. LTE support
- 1.0.3. Fixed a bug that causes crashes.
- 1.0.2. Added an option to display an signal strength in dbm units in the status bar.
- 1.0.1. Fine-tuning icon images.
- 1.0.0. First release