Qtoggleserver

* Core/API: `/ports/{id}/sequence` now uses `PATCH` instead of `POST`.
* Core/Device: added `wifi_signal_strength` attribute support.
* Core/Expressions: added new functions: `AVG`, `ACC`, `INTEG`, `DERIV`, `FMAVG`, `FMEDIAN`, `SEQUENCE`.
* Core/Ports: units are no longer exposed for boolean ports.
* Core/System: adapted Wi-Fi and IP configuration helper commands to new qToggle API.
* Frontend: a faster way of creating HTML elements is now used.
* Frontend: improved navigation experience when using back button.
* Frontend/Ports: expression fields are now represented by text area widgets.
* Slaves: fixed port removal detection at startup.
* Added an initial Dockerfile.

version-0.16.2

* Core: ports are now disabled on server shut down.
* Core/Expressions: fixed `HYST` function mixed up arguments.
* Core/Expressions: expression state is now reset when port is enabled.
* Frontend/Dashboard: fixed PortPickerField not port link not being updated for some widgets.
* Lib/Polled: `port-update` is now triggered on all peripheral ports when updating polling interval.
* Slaves/Ports: current value is now fetched when enabling a port

version-0.16.1

* Frontend: fixed a bug where the PWA was not properly detected on smartphones


version-0.16.0

* Fixed namespace path compatibility with Python < 3.8


version-0.16.0-beta.3

* Frontend: moved frontend files to `qtoggleserver` package
* Fixed bug where `python setup.py install` wouldn't copy frontend files


version-0.16.0-beta.2

* Frontend: fixed `qui` version

version-0.16.0-beta.1