Add Search and Replace

[mcgivrer]

Add Search & Replace

• In the DocumentTab, Add a "Search en replace" feature (CTRL+F) to find a text to be replaced by another one. The search field must propose optional toggles for "Regular Expression", "Full Word", "Respect Casing" for search operation, and the Replace text field is a full text input. The both field must be a laver upon the DocumentTab, show only when search Opeartion are required.
• add a new menu item "Edit" -> "Search..." and "Replace..." menu entries. "Search" entry will only show the "Search" Field (with search options) while the "Replace..." entry will show both.