[directory-upload] Consider renaming getDirectoriesAndFiles to getFSItems (#32)

"getDirectoriesAndFiles" has two problems that I see:

* The FileSystem API spec may at some point want to allow for things that are not files or directories. For example maybe symbolic links if they link to something that's under a Directory that's been exposed to the content.
* The name is 22 characters long which is an extra factor turning people off this new API relative to webkitdirectory.

Perhaps we could call it getFSItems (FS being short for FileSystem)? That's more generic and only 10 characters long, which is twice as long as "files" (even longer if you count the required parentheses for the function call), but hey, better than 22 (or 24).

CC @aliams @arunranga 

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