Add new feature to find file

王权利请求将github/fork/koreamic/file_finder合并到master

Created by: koreamic

Using the regular expression, develop "file finder" feature. (http://feedback.gitlab.com/forums/176466-general/suggestions/4987909-add-file-finder-fuzzy-input-in-files-tab-to-ju)

Issue(#9854 (closed))

合并请求报告