I don't know what's really right or wrong here. It seems fine to also
include the directories in the total byte count, and it makes it a bit
easier to stay consistent when adding up size numbers elsewhere.
Use the new watch_file() mechanism to monitor the currently open directory
for changes and refresh the model when notified. This makes FileManager
automagically show newly added files. :^)
Instead of LibGUI and WindowServer building their own copies of the drawing
and graphics code, let's it in a separate LibDraw library.
This avoids building the code twice, and will encourage better separation
of concerns. :^)
This is the same as calling FileSystemPath(foo).string(). The majority of
clients only care about canonicalizing a path, so let's have an easy way
to express that.
