Plonetheme.imioapps

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- imioapps : skin data displayed in `PrettyLinkWithAdditionalInfosColumn` column,
add some margin between data.
[gbastien]

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- plonemeetingskin : increase base line-height as font-size was increased.
[gbastien]

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- Fix input text/passowrd and textarea background-color so default styles
applied by Firefox are overrided (Firefox 80+).
[gbastien]

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- imioapps : style the `PloneGroupUsersGroupsColumn` column.
[gbastien]
- plonemeetingskin : make sure very large images are not
exceeding the screen.
[gbastien]
- plonemeetingskin : removed useless styles about `actionMenuAX`
that was replaced by `tooltipster`.
[gbastien]
- imioapps : make sure input submit/button use `cursor:pointer`, moreover
fix Firefox disappearance of `outline` when an `input submit` is clicked,
replace it with a `box-shadow` as we use `border-radius`.
[gbastien]
- imioapps : remove multiple definition for `content legend padding`.
[gbastien]

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- plonemeetingskin : moved rules with logic to hide something
back to plonemeting.css
[gbastien]
- Make sure tooltipster tooltip arrow is displayed correctly
(stay sticked to the tooltipster) when zooming in the internet browser.
[gbastien]

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- Added configurable help icon on the site header
[sdelcourt]
- More precise CSS selector to hide CKEditor's spellchecking ad.
[gbastien]