Improve Award Emoji picker

• Add tabs for icons https://gitlab.com/gitlab-org/gitlab-ce/issues/27977
• Ordering frequently used emoji by number of usage
• Add search bar (!2186 (merged))
• Add all possible icons (!2172 (merged))
• Add new list of aliases since we move emoji picker to gemojione icons provider(https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/2198)
• Frequently used emojis (!2180 (merged))
• Hover-over state for icon buttons(!2069 (merged))