ui: Added plain text editing dialog to list boxes in project setup UI

* Added class QtTextEditDialog for displaying text content
* Added edit button to QtDirectoryListBox
* Replaced show files button dialog using QtProjectWizzardContentSourceList with QtTextEditDialog

src/lib_gui/qt/window/QtTextEditDialog.cpp

@@ -0,0 +1,60 @@
+#include "qt/window/QtTextEditDialog.h"
+
+#include <QLabel>
+#include <QPlainTextEdit>
+
+#include "utility/utilityString.h"
+
+QtTextEditDialog::QtTextEditDialog(const QString& title, const QString& description, QWidget* parent)
+	: QtWindow(parent)
+	, m_title(title)
+	, m_description(description)
+{
+}
+
+QSize QtTextEditDialog::sizeHint() const
+{
+	return QSize(550, 550);
+}
+
+void QtTextEditDialog::setText(const std::string& text)
+{
+	m_text->setPlainText(QString::fromStdString(text));
+}
+
+std::string QtTextEditDialog::getText()
+{
+	return m_text->toPlainText().toStdString();
+}
+
+void QtTextEditDialog::setReadOnly(bool readOnly)
+{
+	m_text->setReadOnly(readOnly);
+}
+
+void QtTextEditDialog::populateWindow(QWidget* widget)
+{
+	QVBoxLayout* layout = new QVBoxLayout();
+	layout->setContentsMargins(0, 0, 0, 0);
+
+	QLabel* description = new QLabel(m_description);
+	description->setObjectName("description");
+	layout->addWidget(description);
+
+	m_text = new QPlainTextEdit();
+	m_text->setObjectName("textField");
+	m_text->setLineWrapMode(QPlainTextEdit::NoWrap);
+	layout->addWidget(m_text);
+
+	widget->setLayout(layout);
+}
+
+void QtTextEditDialog::windowReady()
+{
+	updateNextButton("Ok");
+	updateCloseButton("Cancel");
+
+	setPreviousVisible(false);
+
+	updateTitle(m_title);
+}