Release 0.11.0

The floor map became a set of drawings instead of one picture, and search now
reaches what the forms have been collecting all along.

A site can hold more than one building and a building more than one level, and
every map position records which drawing its coordinates belong to. An existing
single-map site upgrades into one building and one default level carrying the
blueprint it already had, and nothing moves on screen. Landmark recalibration
moves a level's markers onto a redrawn plan, solved per axis from the landmarks
and never from the image dimensions, dry run by default, snapshotted before it
applies.

Two identifiers the UI collects were findable in almost no way and two plugins'
records in no way at all: gaugelabreference matched only measuring tools,
maintenancereference matched nothing anywhere, and USB devices and printed items
were absent from search entirely because neither is an asset. All four are
searchable now, from the global bar and from every list's own search box.

Contract 0.20.0 is additive: a plugin that writes a map position must write its
level with it.

The version and the changelog are the release; the detail is in the entry.

docs/PROJECT-MAP.md

@@ -11,7 +11,7 @@ never by editing this file.
 
 | series | value | governed by |
 |---|---|---|
-| product `__version__` | `0.10.0` | ADR-007 |
+| product `__version__` | `0.11.0` | ADR-007 |
 | plugin contract `__contract_version__` | `0.20.0` | ADR-002 |
 
 They move independently. A contract bump is not a release.