bigmem runner works

…#364)

* now auto_scale() by default does not change camera aspect

* center_scene() and maintain_aspect() take only kwargs

* update screenshot images after auto_scale() fix

* add .npy to gitattributes

* add zfish data file

* update imagewidget user demo, add imagewidget test nb, imagewidget auto-updates w.r.t. window_funcs and frame_apply

* use scipy instead of skimage for gaussian filter example

* add ffmpeg to ci

* add imageio[pyav]

* allow_pickle=True for zfish npy load

* add git lfs fetch to screenshots ci, remove allow_pickle

* add imagewidget ground-truth screenshots

* reorganize camera and controller initialization, allow setting them, WIP

* controllers named sync done, not tested yet

* new controllers work, ids also works, changing controllers works

* bugfix

* update nb examples

* update nbs

* controller changes for imagewidget

* fix type annotation

* update example

* update example

* update quickstart nb

* update screenshot

* use perspective camera for everything

* typo

Co-authored-by: Caitlin Lewis <69729525+clewis7@users.noreply.github.com>

* typo

Co-authored-by: Caitlin Lewis <69729525+clewis7@users.noreply.github.com>

* more detailed exception

* better names

---------

Co-authored-by: Caitlin Lewis <69729525+clewis7@users.noreply.github.com>