Make use of new RoomMember item from libquotient

Depends on https://github.com/quotient-im/libQuotient/pull/695

Currently basic just to show a working implementation using RoomMember. Currently only the room event and search models are moved over. Will change everything else over once the dependent pr is complete.

src/utils.cpp

@@ -7,45 +7,6 @@
 
 #include <QJsonDocument>
 
-using namespace Quotient;
-
-static const QVariantMap emptyUser = {
-    {"isLocalUser"_ls, false},
-    {"id"_ls, QString()},
-    {"displayName"_ls, QString()},
-    {"avatarSource"_ls, QUrl()},
-    {"avatarMediaId"_ls, QString()},
-    {"color"_ls, QColor()},
-    {"object"_ls, QVariant()},
-};
-
-QVariantMap QmlUtils::getUser(User *user) const
-{
-    if (user == nullptr) {
-        return emptyUser;
-    }
-
-    const auto &url = user->avatarUrl();
-    if (url.isEmpty() || url.scheme() != "mxc"_ls) {
-        return {};
-    }
-    auto avatarSource = user->connection()->makeMediaUrl(url);
-    if (!avatarSource.isValid() || avatarSource.scheme() != QStringLiteral("mxc")) {
-        avatarSource = {};
-    }
-
-    return QVariantMap{
-        {QStringLiteral("isLocalUser"), user->id() == user->connection()->user()->id()},
-        {QStringLiteral("id"), user->id()},
-        {QStringLiteral("displayName"), user->displayname()},
-        {QStringLiteral("escapedDisplayName"), user->displayname().toHtmlEscaped()},
-        {QStringLiteral("avatarSource"), avatarSource},
-        {QStringLiteral("avatarMediaId"), user->avatarMediaId()},
-        {QStringLiteral("color"), Utils::getUserColor(user->hueF())},
-        {QStringLiteral("object"), QVariant::fromValue(user)},
-    };
-}
-
 bool QmlUtils::isValidJson(const QByteArray &json)
 {
     return !QJsonDocument::fromJson(json).isNull();