Add advanced search term parser

* Support quoted strings & per-field searching
* Support regex and exact matching
* Simplify search sequence
* Make search widget larger
* Add regex converter to Tools namespace

src/gui/SearchWidget.cpp

@@ -137,7 +137,7 @@ void SearchWidget::startSearchTimer()
     if (!m_searchTimer->isActive()) {
         m_searchTimer->stop();
     }
-    m_searchTimer->start(100);
+    m_searchTimer->start(300);
 }
 
 void SearchWidget::startSearch()