Added a simple read-only TableModel and made it accessible via GenericCore.

Basically like in this tutorial: https://doc.qt.io/qt-6/modelview.html#2-1-a-read-only-table

model/tablemodel.cpp

@@ -0,0 +1,38 @@
+#include "tablemodel.h"
+
+TableModel::TableModel(QObject* parent)
+    : QAbstractTableModel{parent} {}
+
+int TableModel::rowCount(const QModelIndex& parent) const { return 5; }
+
+int TableModel::columnCount(const QModelIndex& parent) const { return 5; }
+
+QVariant TableModel::data(const QModelIndex& index, int role) const {
+  const int row    = index.row();
+  const int column = index.column();
+
+  if (!index.isValid()) {
+    return QVariant();
+  }
+  if (row >= 5 || column >= 5) {
+    return QVariant();
+  }
+
+  switch (role) {
+    case Qt::DisplayRole:
+      return QString("Data %1/%2").arg(row).arg(column);
+  }
+
+  return QVariant();
+}
+
+QVariant TableModel::headerData(int section, Qt::Orientation orientation, int role) const {
+  if (role == Qt::DisplayRole) {
+    if (orientation == Qt::Horizontal) {
+      return QString("Section %1").arg(section);
+    } else {
+      return QString("%1").arg(section);
+    }
+  }
+  return QVariant();
+}