XWIKI-10511: Display the user avatar in the topbar in Flamingo

- Moved the less from misc to action-menu
[misc] Comments styling
XWIKI-10511: Display the user avatar in the topbar in Flamingo

- Removed height that made bigger the hover item on small resolutions
XWIKI-10472: Move 'Share by email' menu entry from 'Page' submenu to 'More actions' submenu

- Moved ÔExportÕ entry upper in the menu since itÕs more frequently performed
XWIKI-10472: Move 'Share by email' menu entry from 'Page' submenu to 'More actions' submenu
XWIKI-10511: Display the user avatar in the topbar in Flamingo

- Used the border-radius variable instead of value
XCOMMONS-604: When upgrading on root an extension installed on a subwiki it should be removed from subwiki index
XWIKI-10517: Create the XWiki.Mail class/document at initialization time
+ Added functional test (not fully finished yet)
+ Fixed bug discovered by func test
XWIKI-10496: Refactor files organization in Flamingo Skin.
XWIKI-10518: Bad display of the left column in the user profile.
XWIKI-10223: After you press on the Reset button, the color code is changed, but the color from the field remains unchanged.
XWIKI-10394: CSRFToken warning when navigating to Administration -> Users on a subwiki.
XWIKI-10504: Improve the display of the Color Palette from Administration -> WYSIWYG on Flamingo

- Explicitly overwritten the Bootstrap defaults
XWIKI-10505: Improve the display of the drop-down lists from Administration -> Logging on Flamingo

- removed fixed inline width
XWIKI-10519: Broken gradient color values for #mainmenu when changing the base skin.
XWIKI-10510: Add ability to send emails from a Template document containing a XWiki.Mail xobject
* Impement TemplateMimeMessageFactory
XWIKI-10510: Add ability to send emails from a Template document containing a XWiki.Mail xobject
* Impement DefaultMailTemplateManager
* Fix bugs
* Add some test