Imio.actionspanel

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- Use a real arrow character `🡒` instead `->` when building the transition not
triggerable icon help message.
[gbastien]
- Fixed call to unexisting method `actionspanel_view._gotoReferer()` when
cancelling transition confirmation popup (only happens if popup is not
correctly opened as an overlay).
[gbastien]

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- Rely on imio.history IHContentHistoryView.show_history to know if the history
icon must be shown. We need imio.history >= 1.17.
[gbastien]

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- Added possibility to define a target on the edit action. To do this,
pass the value for `edit_action_target` in the kwargs.
[sgeulette]

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- Added icon on object buttons.
[sgeulette]
- Added separate external edit button
[sgeulette]

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- Rely on `collective.fingerpointing` for logging capabilities, this replace the
log message when an element is deleted.
[gbastien]
- Call `transaction.abort` when an error occurs during deletion in
`DeleteGivenUidView` to avoid leaving portal in an unconsitent state.
[gbastien]

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- Trigger JS event `ap_delete_givenuid` when an element is removed from a
faceted page.
[gbastien]
- Only show the actions panel viewlet on the view of the element, not on the
other templates like `folder_contents` because it also displays buttons and
user could be confused about that.
[gbastien]
- Use same class `apButton` for buttons and select (add content) displayed on
the actions panel viewlet.
[gbastien]