*: web_editor

Users can choose one of their color combination to apply on the header.
If they then choose to make the header transparent over the content for
a specific page, the color of buttons & other components in the header
should be reset to the default website color combination's colors as the
header component are now appearing over the default content.

Part of https://github.com/odoo/odoo/pull/65139

*: web_editor

Before this commit, the elements (other than section) and with the
background layer options avaible (shape, color filter, etc.) did not
have the relative position added on their children. So all the
children were hidden behind the layer element which is in absolute
position.

Part of https://github.com/odoo/odoo/pull/58850
task-2312878

*: website

Inside a color combination (or outside, as considered the same as inside
color combination number 1), the link color can be configured. It is
set by themes to one of the 5 theme colors. Sometimes, no color of
those 5 colors contrast enough with the color combination's background
and we accepted that before, relying on the fact the user can change the
link color if he wants too. Now we automatically increase the contrast
of those link colors, except if the user overrides it.

This system might be extended to all foreground colors in the future but
the system has to be improved for that.

closes odoo/odoo#58538

Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>

Before this commit, the colors of the navbar in the table of content
menu were not adapted to the color combinations system. With navbar in
top position, the background and the colors of the links were using the
same color.

After this commit, the colors of the list-group-item links are also
adapted with color combinations.

task-2312878

closes odoo/odoo#58601

X-original-commit: a0dc17676c570887773854243bcb8cd8823359d5
Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>

*: web_editor

The big boxes snippet's content was appearing below the background
layers (filters, shape, video, etc).

Part of https://github.com/odoo/odoo/pull/58192

*: website, web_unsplash, website_blog

We have recently created an odoo media library that exposes a public API
for searching for open-source media, including dynamic SVGs that can be
used with the dynamic background-shape system to create illustrations
whose colors can be changed by the user. This commit adds the
corresponding client-side functionalty: search for the images in the
media-library, creating a corresponding attachment when selected, as
well as an option to customize the colors of the dynamic SVGs.

In the process, adaptations have been made in the web_unsplash module to
avoid duplicating code and to adapt code that was making assumptions
that are no longer valid.

To make new users more aware of this feature, all default images have
been hidden from the media-dialog, so that the user is prompted so
search for images. Some tests and tours that were relying on having
default images in the media-dialog (eg in website_blog) have been
adapted to match.

task-2316651
Linked to: odoo/iap-apps#235

closes odoo/odoo#56479

Signed-off-by: Jérémy Kersten (jke) <jke@openerp.com>

*: web_editor, website_blog

Unfortunately, this feature revealed a new batch of flaws in the
editor widgets system so some hacks were made to make it work. We will
always have the time to improve the pure technical side later.

This commit also separates the notion of color filter from the notion
of parallax. A color filter can now be applied independantly, when
there is either a background image or a background video. Applying a
color filter on top of a background video is actually a new feature.
Applying a color filter on top of a background image is actually now
achievable by two different ways: this new color filter layer or by
applying the color transformation on the image itself via the related
option. Depending on the user case, both could make sense at the same
time, but more importantly: having a CSS color filter is useful for
using those for default Odoo content (e.g. like the current contact us
page where we use a cover banner with an image with a black filter on
top of it: doing that without CSS color filter would mean to alter the
image directly which would not be ok when the user changes the image).
Also, sometimes you want the unfiltered image on a page and the exact
same one but filtered on another (for example: forum images).

Note: this commit also "fixes" an issue: the optimization feature for
images when parallax was enabled was not available before.

Part of https://github.com/odoo/odoo/pull/47313
task-46147

*: web, mass_mailing, website, website_form, website_sale

New CSS design of the editor (step 1/x).

This work is unfortunately far from perfect but is a first step towards
what we want. In particular, much CSS linked to elements that are meant
to be removed/moved in the upcoming weeks was done in a huge rush but
will thus hopefully be removed/reviewed before the 14.0 release.

As the design is now far more complex including gradients and other
"complex" elements, it was also very difficult to keep a design based on
css-variable so this system was removed, which means that the editor now
appears the same everywhere (backend, frontend, ...). The original goal
of this system was to have an adapted style for backend, frontend and
website visitors. Unfortunately, the current result was a very good
frontend editor design, a not-so-good backend editor design (for mass
mailing at least) and a totally unadapted design for the website
visitors. Making this perfect will be achievable by loading different
assets for those 3 areas and hopefully those assets will only differ by
the values of editor scss variables.

Part of https://github.com/odoo/odoo/pull/53930
task-2157252

Part of https://github.com/odoo/odoo/pull/53930
task-2157252

*: website

Make sure strings are printed quoted and null values are not printed.

Part of https://github.com/odoo/odoo/pull/54065
task-2291398