Better Highlights (#1320)

* Support for user-defined sounds and colors

* Make color & sound columns selectable

* Add custom row for subscription highlights

* Add subscriptions to custom highlights and centrally manage highlight colors

* Dynamically update message highlight colors

src/widgets/helper/ColorButton.hpp

@@ -0,0 +1,18 @@
+#pragma once
+
+namespace chatterino {
+
+class ColorButton : public QPushButton
+{
+public:
+    ColorButton(const QColor &color, QWidget *parent = nullptr);
+
+    const QColor &color() const;
+
+    void setColor(QColor color);
+
+private:
+    QColor color_;
+};
+
+}  // namespace chatterino