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

[lordneeko]

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.