'make pandoc.wasm' will compile a wasm version of pandoc.
This also adds a 'repl' flag to pandoc-lua-engine, so that
support for a Lua repl can be disabled for the wasm build.
A new wasm directory contains:
- pandoc.js, a JavaScript wrapper for pandoc.wasm
- index.html + index.js, a web app exposing all of pandoc's
functionality in a GUI interface
- a set of illustrative examples that can be loaded from the web app
Most of the code in index.html and index.js has been produced in
interaction with Claude code.
This new module exports `pandocVersion` and `pandocVersionText`,
which are no longer exported from Text.Pandoc.Shared. [API change]
Also, we now set the `pandoc-version` variable centrally rather
than in the writers. One effect is the man writer now emits
a comment with the pandoc version (this was intended before,
judging from the template, but it didn't happen because the
vairable wasn't set).
John MacFarlane