MAINT-8883 Restore previous selection after updating the list

Approved-by: Andrey Lihatskiy <andreylproductengine@lindenlab.com>
Approved-by: Andrey Kleshchev <andreykproductengine@lindenlab.com>

MAINT-8844 Fixed selection inconsistancies (inworld manipulation vs tool floater)

Approved-by: Simon Linden <simon@lindenlab.com>
Approved-by: Maxim Nikolenko <maximnproductengine@lindenlab.com>
Approved-by: Andrey Lihatskiy <andreylproductengine@lindenlab.com>

MAINT-8883 FIXED If someone sends a group notice immediately before you, it wipes out the notice you are writing

Roll back optimization that breaks cubemap updates

Approved-by: Andrey Lihatskiy <andreylproductengine@lindenlab.com>

Roll back optimization that isn't needed for sky rendering when atmospherics are used, but is needed for cubemap update.