Added a gutter and currentline highlighting to the SQL editor.

Currently gutter only shows linenumbers. Code is mostly from http://doc.qt.io/qt-5/qtwidgets-widgets-codeeditor-example.html

There is a little bit included in this commit from a first try to make toobars adept to the current tab.

Code #2

pglab/EditorGutter.cpp

@@ -0,0 +1,19 @@
+#include "EditorGutter.h"
+#include "CodeEditor.h"
+
+EditorGutter::EditorGutter(CodeEditor *editor)
+	: QWidget(editor)
+	, codeEditor(editor)
+{
+
+}
+
+QSize EditorGutter::sizeHint() const
+{
+	return QSize(codeEditor->gutterAreaWidth(), 0);
+}
+
+void EditorGutter::paintEvent(QPaintEvent *event)
+{
+	codeEditor->gutterAreaPaintEvent(event);
+}