Removes the current value on focus, so that the user gets to see the available options. If no selection or change is made, the value is reset to the previous value on blur.
Closes#4154.
* Move TagHelpers to Abstractions
Makes them available for use in plugins. Also cleans up the tag helper references in the view code: As we have it in the root view imports, the individual directives in the views are superfluous.
* Move CurrenciesSuggestionsTagHelper back
To get rid of the Rating dependency in Abstractions.
