BaseController __init__() not load data

[wmoore]

The loading of data that occurrs in BaseController? init() should be handled by the new @render_response decorator or within view functions themselfs, so as to only load user, groups etc when needed.

Need to check where this data is currently being used before removing!

This work includes removing all uses of 'eContext' within the Controllers.

[wmoore]

Removed all loading of data in BaseContainer?.init() and all references to eContext.

Replaced usage of eContext either with ome.user provided by new decorator or by E.g. conn.isLeader() in views.py methods.
NB: This included a change to Blitz Gateway to move isLeader() from group to conn.

Final commit ​https://github.com/will-moore/openmicroscopy/commit/831a87aba20d678e5dc76669c91eda8207d5c7f4 on branch ​https://github.com/will-moore/openmicroscopy/tree/render_decorator_7394

Closing...

[Will Moore <will@…>]

(In [b6255a4b7169b70cf1be446015a24ab628d75daf/ome.git] on branch develop) Removing eContext.breadcrumb from webclient. See #8516

[Will Moore <will@…>]

(In [403517de75db462a9251744e5e3e6d0121f0e3c2/ome.git] on branch develop) Using {{ ome.user }} instead of eContext.user. See #8516

[Will Moore <will@…>]

(In [0a3a73bef8a568e7a97beaf000e4db8669f60aa0/ome.git] on branch develop) Use {{ ome.eventContext }} instead of eContext.context. See #8516

[Will Moore <will@…>]

(In [66821281add9a8ee57e5cba84e4ba9145826d0ec/ome.git] on branch develop) Don't load groups in BaseContainer?.init See #8516

The forms that need all groups load them in views.py. Other pages that were
being passed the form_active_group were not actually using it - this has been removed
from views.py too.

[Will Moore <will@…>]

(In [543b47c34c78f8292c799a1e43a12b848a972781/ome.git] on branch develop) Blitz group.isLeader() moved to conn.isLeader()

This method is not based on a Group, but on the eventContext, so it should be available
on the conn itself, not on any particular Group object. Part of cleanup: See #8516