GpasteSearchEntry: add '-l' flag
GpasteHistoryItem: add new item type - link
GpasteListViewRenderer: show color marks for links and text
Utils: add get_url() function
GpasteIntegration: add alternative activation (<Ctrl>Enter - open uri)
GpasteIntegration: flag to search only links
GpasteIntegration: cleanup
GPasteIntegration: fix
GPasteHistorySwitcher: sort histories
update README
update description
GPasteSearchEntry: update tooltip