README: update status, drop WIP flag

while this is not done, it is already useful enough for general cases

DocumentsProvider: set client_dirsize_rbytes=false

update prebuilts

brief changelog:
ceph v17.2.1, with logcat hack, dirsize_rbytes=false performance fix
openssl 1.1.1p

jni: update to quincy

MediaMetadataReader: support audio

DocumentsProvider: add video metadata support

MetadataReader: support mimetypes a la ExifInterface

DocumentsProvider: support reading exif metadata

MetadataReader is ported from AOSP android-12.0.0_r3,
frameworks/base/core/java/android/provider.

DocumentsProvider: fill mime-type on special files

prevents DocumentsUI from displaying a "null" and no icon

DocumentsProvider: use cursor extras for error when allowed

instead of toast + exception, use cursor extras for error string, as
reference recommends. DocumentsUI handles it and displays to user.

DocumentsProvider: detect symlink to dirs

tree: remove ceph.patch

this is unused since pacific rebase, which source is hosted in a new
standalone repo

DocumentsProvider: unify metadata row building

this also fix a case where full path are taken as display names

DocumentsProvider: simplify logging and toasting

Revert "CephMount: add missing IOException throw to mount()"

This reverts commit 3cc32c4928758dbbd559ddf85d419bda28721b4a.

Unneeded modification after 7eb7507da84e9c9405f4b8149e61378594c205aa

DocumentsProvider: wrap remaining mount() to throw IOE

CephFSDocumentsProvider: simplify mount setup handling

CephFSDocumentsProvider: improve log messages

add editorconfig

CephFSDocumentsProvider: root: improve naming

make title shorter, and move cephfs string to summary, which makes it
friendlier to stock DocumentsUI with phone screen