Introduces a **ResponsiveProvider** as the sole location that tracks
window size and makes that info available to the entire app. This can be
used for media queries and size-based component switching.
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Co-authored-by: Jed Fox <git@jedfox.com>

Seems to build fine, will test later.

* style: enforce ordering of imports

* style: sort imports in loot-core

* style: sort imports in desktop-client

* style: sort imports in loot-design

* style: manual fixes