Version 1.2.1

Bugfix release.

A lot of PHP warnings were fixed on Stretch. These errors were due to the output of ifconfig changing, so the scripts couldn't find the required information anymore.

The installer was updated to allow for in-place reinstalls. When old files are found, they are moved out of the way, and any existing configuration files will be backed up.

An uninstall script has also been created to allow for removal of RaspAP without too much hassle.