Fixes #14588 - introduce plugin API for extending template helpers

Fixes #14563 - Improve dashboard layout

The css used for calculating the dashboard layout is overcomplicated and
does not allow for more then 8 rows of widgets without breaking.
This PR cleans up useless code, allows up to 30 rows to be correctly
displayed, and displays widgets that are being dragged instead of only...

Fixes #14190 - consistent api output and search options

Fixes #14521 - better error on missing PXELinux template

Fixes #14566 - remove show_console_action function

The `show_console_action` function is just a trenary operator, no sense
making this a function. This also causes the link to be generated even
if it is not needed, as it is passed to the function as a parameter.

Fixes #14559 - Added support for overriding base url for documentation

Fixes #10278 - don't replace . with - for oVirt VM anymore

The version that supports . in VM names (v3.1.0-18) has been around
for almost 4 years
now (https://github.com/oVirt/ovirt-engine/commit/540a75e0f7bc4b9ed879471d3d830d575c6d6060).

Time to move one and make the VM names in oVirt a bit nicer now.

Fixes #6959 - set operating system for RHEV/ovirt VMs

Backward compatible, but works best with https://github.com/abenari/rbovirt/pull/104

Fixes #14369 - Removed default scope from host counter in taxonomies

Fixes #14572 - fix updating storage in compute profiles based on template