* Add to metadata schema for interconnects.
* New conventional location for pinout diagrams/pics.
* New component to generate the tabs for the new shield
doc section on interconnects.
* Add XIAO and arduino uno pinout diagram.
Co-authored-by: Cem Aksoylar <caksoylar@users.noreply.github.com>
* Make the synthetic "base name" property double underscore prefixed,
since internal, and to avoid future conflicts w/ YAML format add'ns.
* Switch to PS hash dictionaries for our metadata collections for saner
data inspection/use.
