Feature: add bulk library actions

[rhell4]

This includes:

• Bulk update libraries to latest versions
• Bulk upgrade content to latest library version (button will be disabled if there is no content that needs upgrading)
• Bulk export libraries (for importing to another site)
• Bulk import is already a feature using the existing "Upload Libraries"

You'll find the 3 new buttons on the /mod/hvp/library_list.php page

I tested these new options using the following 2 H5Ps in this zip; test-h5p.zip
Both H5Ps are using older libraries, so you should be able to test updating the libraries and the content.

When updating the libraries ensure the content type cache is up to date using the "Update content type cache" at the top of the page because this is required to check if a library has a newer version.

For the bulk export/import, I ran the export on the site I was testing on and then imported into a clean new site I had.

I've also fixed some PHP warnings/deprecations that were filling up the screen/logs when updating or uploading libraries.

[Peterburnett]

Thanks Rossco, this is looking great!. For any future folks, CI is cooked due a ton of lint errors from the main repo, but the tests are passing.