Add highlighting of searched words to the current note.

[dhunt84971]

Searched word highlighting only occurs for the previewed note when the search result button is hovered over. Adding this feature would make the search words highlight in the current notes as well. This feature would only work when the Markdown view was selected and would only be triggered when the search Go button was clicked. Any changes to the calendar that caused the notes to be reloaded would remove the highlighting until the Go button was clicked again.