Fixes #14451 - Allow plugins to add menus to top menu without breaking the second menu

fixes #14202 - enable select2 in interfaces modal

Reverts commit 44723b9 and re-enables select2 in the interfaces modal,
instead fixing the issue with the NIC table detail lines to read the
network information out of select2 dropdown menus correctly.

Fixes #14341 - List all images for compute resource

Previously, the listing was paginated, but since the table is loaded
via ajax and handled by datatables, the pagination had no effect,
leading to a list limited to the max per page (20 usually).
Also, improved the lookup to only bring the needed data.

fixes #12962 - Add Xenserver to list of supported OS families.

Templates are included in community-templates repo.

Fixes #12979 - Create helper for "new" button

Previously the button classes were applied to new buttons using jQuery.
This commit creates a `new_link` helper that makes sure all new buttons
will receive the correct class and only display if authorized. Also a...

fixes #14318 - load JS translations table for current locale only

fixes #14041 - don't call select2 on CR form templates

select2 must be called only when the select becomes visible, not for
hidden template elements. add_child_node() already does when adding a
new set of fields from the template. without_select2 is removed from...

Refs #7726 - Improve select all for filtered multi-select

Fixes #13091 - Paginate VMs for supporting compute resources

Loading all VMs for the compute resource view can be a very heavy task,
which leads to timeouts when attempting to load all VMs for a compute
resource that has many hundreds or thousands of VMs. This patch allows...

fixes #13066 - Improve readability of blank slate pages

Increase font size and reduce width of description of blank slate pages
to improve readability.