Minor fixes and systemd-networkd support

• Fix start dnsmasq is it is enabled
• Fix timer to start after being activated since Pi3 boot time is always 1970
• Add support for systemd-networkd and configurations for interface, driver and channel

Full Changelog: v0.0.5...v0.0.7

Updated version to work with different python versions

Some changes so the deb can be installed on buster and bullseye

First release

v0.0.3

Update readme