Integrate new Web-Interface

[seclorum]

We have moved to a new Web-Interface technique in MS3KOS2.0, based on generating the user interface from a protobuf declaration that is shared between the Web code and the onboard MS3KOS Firmware. This enables us to easily add user-facing/-editable parameters to the Web Interface to support parameters required by the Firmware modules.

The new Web-Interface build artefacts therefore need to be generated and built into a final firmware filesystem (SPIFFS) image for inclusion in MS3KOS2.0. The steps required to do this right now are being manually performed - obviously we need to automate the build/package process to make this better integrated before release.