This changes (some) directives to allow trailing `.tag`'s to work around
the issue of duplicate keys not being available.

Signed-off-by: Simon de Vlieger <cmdr@supakeen.com>

These were defined as a group effort during a live programming session
on a video call. They're 'how we want things to work', not how things
currently work.

Signed-off-by: Simon de Vlieger <cmdr@supakeen.com>

For consistency with Ansible it's preferable to use underscores instead
of dashes for directive names.

Signed-off-by: Simon de Vlieger <cmdr@supakeen.com>

After more discussion yesterday this shows an example of how
customizations can be used and splits up the pipeline.

Signed-off-by: Simon de Vlieger <cmdr@supakeen.com>

With the future include of conditionals we have decided that
modifications will not be special cased in directives but instead will
be based on convention in the defines.

Signed-off-by: Simon de Vlieger <cmdr@supakeen.com>

Signed-off-by: Simon de Vlieger <cmdr@supakeen.com>