APWeb/files/data/apm.pdef.xml is old and doesn't update with AP

Need to find a way to link this file to the build output of ardupilot.
There are project using this APWeb now (e.g. Companion) and it would be beneficial to them if the params were up to date in APWeb.

Also, it should probably generate an xml for multiple frame types (copter,plane, etc) and the paramater.html should detect them and autopopulate a drop-box to allow a user to select what frame type they have.

Alternatively, since all frames have the parameter FRAME_TYPE, it can probabl figure it out automatically.

Start by inspecting APWeb/files/data/apm.pdef.xml and parameter.html, then compare the file with ArduPilot build output. Clarify how APWeb should receive current parameters and whether to generate separate XML files for copter, plane, and other frame types. Done means APWeb uses up-to-date parameters and lets users select or automatically identify their frame type.

Written by the indexing model from the issue text.