start channel list refactor for server list

src/components/channellist/classic/guildlist.cpp

@@ -0,0 +1,23 @@
+#include "guildlist.hpp"
+#include "guildlistfolderitem.hpp"
+
+GuildList::GuildList() {
+    set_selection_mode(Gtk::SELECTION_NONE);
+    show_all_children();
+}
+
+void GuildList::AddGuild(Snowflake id) {
+    const auto guild = Abaddon::Get().GetDiscordClient().GetGuild(id);
+    if (!guild.has_value()) return;
+
+    auto *item = Gtk::make_managed<GuildListGuildItem>(*guild);
+    item->show();
+    add(*item);
+}
+
+void GuildList::Clear() {
+    const auto children = get_children();
+    for (auto child : children) {
+        delete child;
+    }
+}