Move highlight phrases to new settings system

Add a setting serialize/deserializer for QString
Add constructor to ChatterinoSetting that doesn't take a default value

src/messages/highlightphrase.hpp

@@ -0,0 +1,78 @@
+#pragma once
+
+#include "util/serialize-custom.hpp"
+
+#include <QString>
+#include <pajlada/settings/serialize.hpp>
+
+namespace chatterino {
+namespace messages {
+
+struct HighlightPhrase {
+    QString key;
+    bool sound;
+    bool alert;
+
+    bool operator==(const HighlightPhrase &rhs) const
+    {
+        return std::tie(this->key, this->sound, this->alert) ==
+               std::tie(rhs.key, rhs.sound, rhs.alert);
+    }
+};
+}  // namespace messages
+}  // namespace chatterino
+
+namespace pajlada {
+namespace Settings {
+
+template <>
+struct Serialize<chatterino::messages::HighlightPhrase> {
+    static rapidjson::Value get(const chatterino::messages::HighlightPhrase &value,
+                                rapidjson::Document::AllocatorType &a)
+    {
+        rapidjson::Value ret(rapidjson::kObjectType);
+
+        AddMember(ret, "key", value.key, a);
+        AddMember(ret, "alert", value.alert, a);
+        AddMember(ret, "sound", value.sound, a);
+
+        return ret;
+    }
+};
+
+template <>
+struct Deserialize<chatterino::messages::HighlightPhrase> {
+    static chatterino::messages::HighlightPhrase get(const rapidjson::Value &value)
+    {
+        chatterino::messages::HighlightPhrase ret;
+        if (!value.IsObject()) {
+            return ret;
+        }
+
+        if (value.HasMember("key")) {
+            const rapidjson::Value &key = value["key"];
+            if (key.IsString()) {
+                ret.key = key.GetString();
+            }
+        }
+
+        if (value.HasMember("alert")) {
+            const rapidjson::Value &alert = value["alert"];
+            if (alert.IsBool()) {
+                ret.alert = alert.GetBool();
+            }
+        }
+
+        if (value.HasMember("sound")) {
+            const rapidjson::Value &sound = value["sound"];
+            if (sound.IsBool()) {
+                ret.sound = sound.GetBool();
+            }
+        }
+
+        return ret;
+    }
+};
+
+}  // namespace Settings
+}  // namespace pajlada