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.h

@@ -3,14 +3,9 @@
 
 #pragma once
 
-#include <QColor>
-#include <QGuiApplication>
-#include <QPalette>
 #include <QQmlEngine>
 #include <QRegularExpression>
 
-#include <Quotient/user.h>
-
 class QmlUtils : public QObject
 {
     Q_OBJECT
@@ -30,31 +25,12 @@ public:
         return _instance;
     }
 
-    Q_INVOKABLE QVariantMap getUser(Quotient::User *user) const;
     Q_INVOKABLE bool isValidJson(const QByteArray &json);
 
 private:
     QmlUtils() = default;
 };
 
-
-namespace Utils
-{
-
-/**
- * @brief Get a color for a user from a hueF value.
- *
- * The lightness of the color will be modified depending on the current palette in
- * order to maintain contrast.
- */
-inline QColor getUserColor(qreal hueF)
-{
-    const auto lightness = static_cast<QGuiApplication *>(QGuiApplication::instance())->palette().color(QPalette::Active, QPalette::Window).lightnessF();
-    // https://github.com/quotient-im/libQuotient/wiki/User-color-coding-standard-draft-proposal
-    return QColor::fromHslF(hueF, 1, -0.7 * lightness + 0.9, 1);
-}
-}
-
 namespace TextRegex
 {
 static const QRegularExpression endTagType{QStringLiteral("(>| )")};