- Reuses existing protobuf infrastructure to greatly cut down on the
JNI boilerplate
- Ensures all calls have errors handled, and happen behind a mutex
- Removes separate downgrade + open11 calls in favour of a flag to
the standard collection opening routine
- Various code cleanups

…lures

Matches desktop behaviour

Accessed with backend.tr.someTranslationName()

- Extracted from pinned sha in upstream repo
- Maintainer needs to commit change to submodule

- Reduce the numbers of factories, and provide some helper routines
in AnkiSupportSQLiteDatabase to create Rust-based and Framework-based
instances.
- BackendFactory now provides static methods to create a backend,
and supports configuring the default languages and schema version (
which the AnkiAndroid code will use)
- Backend instances have their schema version set at creation, instead
of collection open.

Closes ankidroid#175

I'm surprised it can't handle a 45MB alloc. Switched to a streaming
approach, that requires reading the file twice in the initial write case.

The sync code expects to find the version number in a buildinfo.txt
file. For now, check it into source control so that Bazel is only required
when bumping the anki dependency (or you could edit the file manually)

Closes ankidroid#24

Large collections dump thousands of lines in the logs when showing the
deck picker.

- Add an ineffective lock to ensureSetup()
- Document why it doesn't work, and why the error needs to be swallowed
in loadPath
- Don't attempt to load the library normally when running under
Robolectric

Closes ankidroid#198

Instead of checking buildinfo.txt and the web files into this repo,
we should either generate them as part of the build, or rely on a pinned
pre-generated file. The latter is the easier short-term solution, as it
requires minimal updates to CI, and won't balloon out the build times.
It's more work when bumping versions though, so in the long time AD may
want to consider adopting Bazel in this repo once this code has sufficiently
proven itself.

There's probably room for improvement in the download/unpack task - I'll
leave that for someone with more Gradle experience. I am not able to test
the artifact build/upload from the repo fork, so have temporarily placed the
generated file on ankiweb.

This reverts commit 2828381.

This has a few issues that need resolving before it's usable:

- Need to tell Gradle that unpackAnkiArtifacts should be run prior
to the cargo lines
- downloadAndPrepareArtifacts chokes on clean build because rsdroid/build
does not exist; probably needs creating if missing

Android sends it to /dev/null by default

If they block due to a concurrent operation, the UI will freeze until
it completes, so these operations should be moved to a backend thread
over time (in many cases, there's a backend operation that can be used
instead)

Reveals deck list's renderPage() invokes a lot of SQL queries, and
isCurrentlySelectedDeck() queries the current deck each time.

I tried using the site to import the docs/source files, but it told me
it wasn't a valid file type, so I've just removed the diagrams for now.

Makes working with messages easier in the AnkiDroid repo

ankidroid#209 (comment)

ankidroid#202 (comment)

ankidroid/Anki-Android#11711