another crash avoidance for columns in view mode :-(
create RCloud.promisify_paths utility

so that users can promisify their own blocks of APIs
create upload_utils; artifacts

RCloud.upload_* should be available regardless of ocaps
because you can pass the ocaps into them now
access to session_pane.error_dest
default options for both UI.upload_files and UI-less upload

also give options to all upload UI elements
i think this is the most maximally configurable upload experience possible