Support converting "old" sensor ids to "new" sensor ids on face load

The network plugin changed the sensor ids of a number of sensors. To support old configuration files, we need to translate these sensors from their old IDs to the new. This adds support for that when loading sensor faces and presets. In addition, when loading a pre-existing configuration, it will write back the new sensor ids.

This includes an autotest to check if the replacement works as intended, though I needed to do some shuffling to make the autotest possible.