The order in which UX defined the different sections are:
- Installed Cura Plugins
- Installed Materials
- Bundled Plugins
- Bundled Materials
All packages need to be order at least by section, but I also took
the liberty to sort the packages in these sections by Alphabet.
Contributes to CURA-8558
By providing a `section_title` with a string to the `package_data`
packages can be subdivided in sections, each with its own header.
For remote packages this will be `None` and therefore no sections are
created there.
Contributes to CURA-8558
There is a distinction between packages which are already
installed on the local machine and packages which are
available on the remote server. Even with this difference
it is important that they are handled the same and can be
reused in the same GUI elements.
In order to reduce code duplication I created a parent object
PackageList which contains the base logic and interface for
the QML and let both RemotePackageList and LocalPackageList
inherit from this.
UX specified that the gear icon (Settings.svg) should be
separate from the tabs of material and plugins. This also
ment that the current tab item couldn't set the pageTitle
anymore. This is now defined in the Package component and
set when the loader has loaded the external QML file.
Contributes to CURA-8558
