Whistle Find (Unreleased)

When the device is inactive (i.e. the screen is off) it will listen to environmental sounds and if it detects a whistle, it will play the configured sound so you can find the device.

In the configuration view:
- The service can be activated/deactivated (although activated, it will only trigger the alarm if the device is inactive).
- It can be configured to load on boot (otherwise it only loads when clicking the app icon to open the configuration).
- The whistle detection can be configured with easy or advanced options, changing the level of difficulty in detecting whistles (so the alarm won't be triggered so easily).
- The whistle detection can be tested from the configuration view.
- The notification sound can be selected.
- The notification volume can be set.
- The number of repetitions or repetition time of the notification can be configured.
- The notification sound can be tested for the selected parameters.