Fix a typo in a comment of the update-raw-property application code
Implement application of unset-raw-property actions
Add scenario tests for unset-raw-property actions
Merge branch 'jannispohlmann/implement-unset-raw-property'

Signed-off-by: Jannis Pohlmann <jannis.pohlmann@codethink.co.uk>
Reviewed-by: Adam Coldrick <adam.coldrick@codethink.co.uk>