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.cpp

@@ -0,0 +1,23 @@
+#include "widgets/helper/ColorButton.hpp"
+
+namespace chatterino {
+
+ColorButton::ColorButton(const QColor &color, QWidget *parent)
+    : QPushButton(parent)
+    , color_(color)
+{
+    this->setColor(color_);
+}
+
+const QColor &ColorButton::color() const
+{
+    return this->color_;
+}
+
+void ColorButton::setColor(QColor color)
+{
+    this->color_ = color;
+    this->setStyleSheet("background-color: " + color.name(QColor::HexArgb));
+}
+
+}  // namespace chatterino