Separate UI to new file, still not quite complete.

Also fixed code style in files, and settings used by CLion.

ui.cpp

@@ -0,0 +1,35 @@
+#include "ui.h"
+
+ui::ui(int argc, char **argv) {
+	app = new QApplication(argc, argv);
+	mainWindow = new QWidget();
+	mainWindow->resize(1280, 720);
+	mainWindow->setWindowTitle("oksirc - early Qt test");
+
+	mainLog = new QPlainTextEdit();
+	mainLog->setReadOnly(true);
+	textEntry = new QLineEdit();
+	QPushButton *sendButton = new QPushButton(QApplication::translate("send", "Send"));
+	QObject::connect(sendButton, &QPushButton::clicked, this, &ui::sendButtonClicked);
+
+	QHBoxLayout *entryLineLayout = new QHBoxLayout();
+	entryLineLayout->addWidget(textEntry);
+	entryLineLayout->addWidget(sendButton);
+
+	QVBoxLayout *mainLogAndLineLayout = new QVBoxLayout();
+	mainLogAndLineLayout->addWidget(mainLog);
+	mainLogAndLineLayout->addLayout(entryLineLayout);
+	mainWindow->setLayout(mainLogAndLineLayout);
+	mainWindow->show();
+	textEntry->setFocus();
+}
+
+int ui::exec() {
+	return app->exec();
+}
+
+void ui::sendButtonClicked(bool checked) {
+	this->mainLog->appendPlainText("Send button clicked!");
+	this->mainLog->appendPlainText(textEntry->text());
+	textEntry->clear();
+}