This adds several new columns to the directory view. It adds a last
modified timestamp, a logo for the type, human-readable file sizes, and
permissions. Several of these are configurable via the
config/settings.json file.
This change passes the file name to monaco, so it can use its own
detection to determine highlighting of supported files. It also resolves
some of the mimetypes with more common use cases for a terminal.
This mainly focuses on passing directory info to the front end. It isn't
a complete version of that, but it's enough to plan out some details of
the styling
