Explicitly present on containers

[Deliver #42989037]

Workaround for some environments that have a problem with propagating
modal presentation to containers
Merge branch 'hotfix/v2.6.1' into integration
Fixing tests for new xcode
Merge branch 'fixing-tests' into integration
Expose share options in social 'posting' callbacks

willAttemptPostingToSocialNetworkBlock gets SZShareOptions

[Deliver #43610727]
Twitter text now shows ellipses when truncated

[Deliver #43611665]
Add docs example for including user share text

[#43610727]
display should be a weak ref

... since it is often the presenting view controller
Fix a circular ref in showShareDialog

[Deliver #43615081]
Restore test list controller showshare

Was broken by a previous commit
Fix a circular ref in share view controllers

Affects: _SZShareDialogViewController, _SZSelectNetworkViewController
Fix circular ref

Action bar on first unauthed like

... Missed an __unsafe_unretained on conversion to arc of SDKHelpers

[Deliver #43617569]