Add support FrankerFaceZ badges. (#2101)

On startup, we poll https://api.frankerfacez.com/v1/badges/ids and store the mappings of user IDs to badges for the remainder of the applications lifetime.

src/providers/ffz/FfzBadges.hpp

@@ -0,0 +1,32 @@
+#pragma once
+
+#include <boost/optional.hpp>
+#include <common/Singleton.hpp>
+
+#include "common/Aliases.hpp"
+
+#include <map>
+#include <vector>
+
+namespace chatterino {
+
+struct Emote;
+using EmotePtr = std::shared_ptr<const Emote>;
+
+class FfzBadges : public Singleton
+{
+public:
+    virtual void initialize(Settings &settings, Paths &paths) override;
+    FfzBadges() = default;
+
+    boost::optional<EmotePtr> getBadge(const UserId &id);
+    boost::optional<QColor> getBadgeColor(const UserId &id);
+
+private:
+    void loadFfzBadges();
+    std::map<QString, int> badgeMap;
+    std::vector<EmotePtr> badges;
+    std::map<int, QColor> colorMap;
+};
+
+}  // namespace chatterino