Fix EZP-23584: Impossible to edit and publish the same content 2 times in a row

This is caused by https://github.com/yui/yui3/issues/1982 and the fix introduces
a workaround for that.
Fix EZP-23583: Added the form handling in the server side part
Removed a console call in the serversideview unit test
Improved the templates in the section part to improve the style of the page
Added the requirement on the eZ Publish version in the README
[ci skip]
Merge pull request #124 from ezsystems/admin_tpl_improved

Improved the templates in the section part to improve the style of the page
Merge pull request #123 from ezsystems/ezp-23583_admin_forms

EZP-23583: As an editor, I want to be able to use forms in the administration part of the PlatformUI App
Merge pull request #122 from ezsystems/ezp-23584_edit_two_times

Fix EZP-23584: Impossible to edit and publish the same content 2 times in a row
Fix EZP-23715: Impossible browse the media library with the PlatformUI
Fix EZP-23712: The content edit form moves if you put the mouse over the title

Also rewrote how the tech infos are shown/hidden to use only CSS and avoid
asynchronous tests because of a graphical effect
Removed the bottom padding on the header in the content edit page
Refactored the relation and relationlist field views to not duplicate code
Fixed a wrong comment in the relation field view
Fixed a minor cs issue in relationlist view test
EZP-23718: added a plugin to load an image variation
EZP-23718: added the image field view
EZP-23718: added a custom image alias to display images in the rawcontentview
Fix EZP-23099: In Firefox, the height of the tree is not limited
Merge pull request #131 from ezsystems/ezp-23099_tree_height_firefox

Fix EZP-23099: In Firefox, the height of the tree is not limited
Merge pull request #127 from ezsystems/ezp-23715_media_lib

Fix EZP-23715: Impossible browse the media library with the PlatformUI