Fixes #13047, #16291 - Upgrade datatables and move it to npm

Fixes #16416 - Enable reterive password_hash from templates

Fixes #16405 - Allow roles search by builtin flag

Fixes #16318 - PXE templates now work in safemode (#3783)

pxe_kernel_options added to safemode

Fixes #16164 - False positives on testing CR connection

Prevents from showing success message when there's a validation
error in the returned form and adds error handling for
the test connection ajax call.

Fixes #16144 - vmWare datacenter error in connection test

Fixes #16357 - Losslessly optimized assets

Ran some lossless optimisation on foreman’s images

Refs #15814 - Reset override params only for PuppetclassLookupKey

Fixes #16379 - Improve layout of hostname randomize button

This moves the button from being a line of its own to a button in the
input.
Also changed the form helper to streamline adding button to inputs and
got rid of a useless helper.

Fixes #16371 - Add support for login page dynamic text

Adds a new general setting called login_text. If this
is set to a value, then the text is shown under the product
and version information on the login page.