add support for fallback keys

See merge request matrix-org/olm!13

Add 4 by default, and make sure OT keys are not reused.

Fix JS demos, which had bitrotted

See merge request matrix-org/olm!12

Thanks to Dominic Fischer for spotting.

Allows building an WASM-ready archive with emscripten.

This allows e.g. to compile to the `wasm32-unknown-unknown`
target with Rust.

Related matrix-rust-sdk PR:
https://github.com/matrix-org/matrix-rust-sdk/pull/31



Signed-off-by: stoically <stoically@protonmail.com>

Add TypeScript definition file

See merge request matrix-org/olm!11

Fix some math blocks

See merge request matrix-org/olm!10

Without that, if olm is installed to a non-standard location, the user code might run CMake configuration fine but further building will fail.

Signed-off-by: Alexey Rusakov <Alexey.Rusakov@pm.me>

Add olm_session_describe

See merge request matrix-org/olm!9

instead of having a static one, as that could end up taking up a
lot of memory if your app keeps olm sessions hanging about.

As a way to dump the state of an olm session, ie. the chain indicies,
so we can debug why olm sessions break and get out of sync.

Build the js objects without PIC

See merge request matrix-org/olm!8

Fix comment and also js build

See merge request matrix-org/olm!7

This confuses emscripten now

The python that searches the header files for exports isn't smart
enough to know what is a comment and what isn't, so it picks this
up too and emscripten then complains about it being undefined.