tell us if it breaks
support alternate versions of photos (edits)
fix
more edits stuff

* make construction of new Photos more self-contained
* make edits themselves also photos, making it easier to load them
* support creating new edits through keybind
clearer errors
indendation etc fixes
edits
probably better
auto generate thumbnails for new edits
binds to go Home/End
support display edits and navigating left/right
auto-create edits_dir, logic fixes
update readme