Relicense Quickstarts and BOMs as Apache 2.0

There has been a bit back and forth on the bom and QS licenses in WF12, 13 and 14. For WF15, we should relicense them all (where possible) to Apache 2.0.

Note that we will need:
A LICENCE.txt in the root folder
The name of the license in the BOMs should be from the 'Full Name' column of https://spdx.org/licenses/