Implemented a new, better looking tooltip. (#158)

* Implemented a new, better looking tooltip.

* Pajlada fix.

* Fixed dragging behaving incorrectly.

* Fixed out of focus hovering getting stuck.

src/widgets/tooltipwidget.hpp

@@ -0,0 +1,34 @@
+#pragma once
+#include "widgets/basewidget.hpp"
+
+#include <QWidget>
+#include <QLabel>
+
+namespace chatterino {
+namespace widgets {
+
+class TooltipWidget : public BaseWidget
+{
+    Q_OBJECT
+public:
+    TooltipWidget(BaseWidget *parent = nullptr);
+
+    void setText(QString text);
+    void moveTo(QPoint point);
+
+    static TooltipWidget* getInstance()
+    {
+        static TooltipWidget *tooltipWidget = nullptr;
+        if(tooltipWidget == nullptr)
+        {
+            tooltipWidget = new TooltipWidget();
+        }
+        return tooltipWidget;
+    }
+
+private:
+    QLabel *displayText;
+};
+
+}  // namespace widgets
+}  // namespace chatterino