popup browser upload support
pass proper type around
select uploaded file by default
file browse fixes
parent is required
protect handle_panel method; apply boostrap css/structure to upload modal
handle upload errors (storage) in upload modal
refactor browser/upload into separate closures; make the mode-aware (link/image -- any/image). Behave accordingly
proper implementation/handling of (non)selectable content and select button state
use callback to load uploaded content into browse modal
expose File/Image spoke's handle_download method
very simple image insert support
image update support; temp workaround for handling /download mess
update select button depending on selection
add tabs for external image/links
remove title/header from modal