Added __iter__ and Filter support to LazyTable.
Moved functionality from LazyRowInstance to LazyTable.__getitem__
Added .table_origin support.
Probably broke region_of_interest support.
Let region_of_interest work as it was before.
Merge branch 'selectdatasupport' into develop.
Introoucing Filters, iteration and origin_table of LazyTable.
Functionally solving [#9]: the SelectData widget works now.
However, implementing instance_identifier_global would allow
a much nicer implementation!