Tabs: Move `aria-expanded` from active panel to active tab

Fixes #9622
Closes gh-1251
README: Remove content that exists on the contribute site
Build: Update DB version for release script
Tests: Add widget option

Allows running qunit tests for a single widget

Closes gh-1254
Spinner: Don't change value when changing min/max options

Fixes #9703
Closes gh-1252