Provide the full list of components, variables, units, etc.

[agarny]

Right now, if we want to go through all the (top-level) components in a model, we must do something like:

for (size_t i = 0; i < model->componentCount(); ++i) {
    // Do something with model->getComponent(i)
}

while I wish we could simply do something like:

for (const auto &component : model->components()) {
}

which is more "modern"...

[hsorby]

We are old-school :)