feat: set smartquotes=False for Sphinx

See merge request !11

Fix PHP tests and run them in CI

Closes #14

See merge request !10

Install PHP test runner into Docker test environment.

Fix PHP test failures by porting the fixes that have already been made to the
matching Python tests.

Run PHP tests when running tox (which will run them in CI).

Always build the Docker Compose test environment when `./test.sh` is run.

Update client to 1.3.2

Closes #12

See merge request !9

Dockerize build and test flow, and enable GitLab auto-DevOps

Closes #11

See merge request !8

Remove clean-up code from `test.sh` as it's not needed when using
`docker-compose run` (and indeed produces a confusing error).

Add extra line to generated Python methods file (lint fix).

Fix typo in the README file.

Add Dockerfiles for generating environments in which to build/test the
deliverables.

Add Docker Compose configuration for running the build and test flows.

And scripts for starting the build and test flows.

Ensure build directory exists to avoid permission issues with build flow.

Modify GitLab CI/CD configuration to run jobs for building the deliverables
and running the tox tests (in containers using Docker-in-Docker).

Enable full set of GitLab auto-DevOps jobs.

Add coverage collection to the test job.

Add example secrets file and modify the unit tests to use the secrets.

Modify tox configuration to pass on secrets to the tests and to collect
coverage data.

Update the README with information about running the build and test flows via
Docker Compose, about making a release, about setting up CI/CD and about
secrets.

Make PHP document generation depend on the required Docker image.

Enable use of Docker inside the build container (required for building PHP
documentation).

Run build container as root user to avoid permissions issues with Docker.
Force all writable files to be owned by the current user when the container
exits.

Fix use of Virtualenv when building Python documentation.

Modify PHP documentation generation script to be able to run inside a
container.

Fix use of `sed` in the PHP documentation generation script.

Override some SAST "spotbug" job options to use the build.

Update lookup test url

See merge request !7

Remove unused certs from client.

See merge request !6

refresh build system

Closes #8

See merge request !5

Refresh build system post release of 1.3.0. Port the various helper
scripts to Python3 and remove JRE 1.6 support as that is well EoL-ed by
now.

make use of requests library to handle TLS

Closes #4

See merge request !4

Code-side changes for #1

Remove the unsupported Python 2 client's code.

Rather than rolling our own SSL wrapper, make use of the one in
requests. Allow a custom requests.Session object to be passed into the
connection if custom behaviour such as CA pinning is required.

Closes #4

PHP: Remove use of own cacerts.txt file

Closes #5

See merge request !3

Resolve "Python3 client fails to serialize attributes"

Closes #2

See merge request !2

Add README and remove building support for Python 2 libraries