Formalize zero-width emote implementation (#4314)

Co-authored-by: Rasmus Karlsson <rasmus.karlsson@pajlada.com>

src/widgets/TooltipEntryWidget.hpp

@@ -0,0 +1,42 @@
+#pragma once
+
+#include "messages/Image.hpp"
+
+#include <QLabel>
+#include <QWidget>
+
+namespace chatterino {
+
+class TooltipEntryWidget : public QWidget
+{
+    Q_OBJECT
+
+public:
+    TooltipEntryWidget(QWidget *parent = nullptr);
+    TooltipEntryWidget(ImagePtr image, const QString &text, int customWidth,
+                       int customHeight, QWidget *parent = nullptr);
+
+    void setImageScale(int w, int h);
+    void setWordWrap(bool wrap);
+
+    void setText(const QString &text);
+    void setImage(ImagePtr image);
+    void clearImage();
+    bool refreshPixmap();
+
+    bool animated() const;
+    bool hasImage() const;
+    bool attemptRefresh() const;
+
+private:
+    QLabel *displayImage_ = nullptr;
+    QLabel *displayText_ = nullptr;
+
+    bool attemptRefresh_ = false;
+
+    ImagePtr image_ = nullptr;
+    int customImgWidth_ = 0;
+    int customImgHeight_ = 0;
+};
+
+}  // namespace chatterino