DRILL-6921: Add Clear button for /options filter
This commit adds the following search enhancements:
1. Addition of a clear ('x') button in the search field
2. If a filter term has been entered in the search box, on clicking the Update or Reset-to-Default button of any option, the reloaded page will re-apply the last entered filter term in the search box.
3. If the search box is empty, on clicking the Update or Reset-to-Default button of any option, the reloaded page will automatically filter out everything except the updated/reset option to show the changed value.
4. Customization of the quick search terms. (using defaults in drill-module.conf)
closes #1588
