Runtime Motif Configuration

[paragonie-scott]

Coming in v1.3.0, Airship captains should be able to adjust configuration options for their motifs instead of creating their own motif and adjusting the knobs there.

In templates, this will be facilitated by a new global (MOTIF) that provides read-only access to the current configuration.

{{ MOTIF["header"]["background-color"] }} {# example: #00FF00 #}
{% if MOTIF["showLogo"] %} <img src="foo" />{% endif %}

We may also want to allow some motifs to allow users to customize their experience. I'm not sure if I'll fold this into 1.3.0 or wait until a new version, as it does increase the complexity significantly.

[paragonie-scott]

Done.