* Add commercial licence and update config files
* Update license in headers
* Revert "Update license in headers"
This reverts commit 7ed7949485.
* Update only spdx id
* Remove LicenseRef- from package.json
LicenseRef- no longer allowed in npm v3 package.json
This fixes the warning in the logs and failing build check.
* Apply `strictNullChecks` to `src/utils/exportUtils`
* strict fix
* fix strictNullChecks issues in some utils
* fix error message
* test coverage
* lint
* more strictNullChecks
* small optimisation for getUniqueRoomsWithIndividuals
* tidy
* test coverage