Release 1.8.24

There are now some differences in the top "app bar" menu choices
depending on how many notebooks are selected:

- The "export" and "rename" choices are removed when multiple notebooks
  are selected.
- When setting the repository link of multiple notebooks, no repository
  is pre-selected, even if all notebooks are currently linked to the
  same repository. The rationale is that I found no good way of showing
  existing links to multiple repos, so it seemed better to me to never
  make a pre-selection.
- When deleting a single notebook, its repository URL is shown in the
  dialog prompting whether to delete the linked repository file.
  However, when deleting multiple notebooks, no repository URLs are
  shown. The rationale is that I found no intuitive way of presenting
  multiple URLs in the dialog along with their corresponding notebooks.

We are now requesting the correct permission on for Android sdk level
33 and above.

Grant the READ_MEDIA_IMAGES permission during ExternalLinksTest

Grant permission when running the relevant API version

Fixes the image loading

Allow selecting multiple notebooks