Autocomplete: Fall back to .ui-front searching for empty jQuery objects

Fixes #9755
Autocomplete: Normalize falsy values, not just missing values

Fixes #9762
Test: Whitespace
Tests: Add link to selectmenu in unit index
All: Wrap source files with UMD return exports

Ref #9464
Ref gh-1029
All: Wrap I18n files with UMD return exports

Ref #9464
Ref gh-1029
All: Remove "Depends" comment

Ref #9464
Ref gh-1029
All: Rename all files, removing the "jquery.ui." prefix;

- By executing https://gist.github.com/jzaefferer/893fcf70b7eebc1dc271;

Fixes #9464
Closes gh-1029