New refreshOptions method for refreshing the options. #564
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Refactored switching of visiblity of elements in buildFilter to new updateVisibilityByFilter method. Then added new refreshOptions for refreshing of the options without rebuilding the whole UI --- preserving filter and keyboard cursor focus this way.
Originally needed this feature for the Knockout bindingHandlers: Didn't want to lost keyboard focus and other UI state when updating the options dynamically. This feature could help also at least with issue #483 ("When reconstructs the component the state is lost. To what was typed disappears").