Smartmeter-datacollector

Improvements

* add L+G E570
* update frontend & backend dependencies

Improvements
- add L+G E360 meter
- add Kamstrup HAN meter
- update frontend & backend dependencies

Changes
- add support for Python 3.10, remove Python 3.7 support
- update `.deb` package build to `bullseye` (Raspberry Pi OS & Debian)

- update frontend & backend dependencies
- update Node.js version to 16 (LTS)

**Improvements**
* make sure the pbuilder chroot is updated before a build
* run "apt-get update" before instaling anything in GitHub workflows

**Bugfixes**
* don't automatically determine Python package dependencies when building a Debian package

**Features**
* support ISKRAEMECO AM550 smart meter over P1

**Improvements**
* remove EKZ logo from frontend header
* add acknowledgements to frontend footer

**Bugfixes**
* fix clearing the HDLC buffer if it gets too large