This adds a few new functions to the JavaScript bindings. It also adds
our JavaScript docs into the CMake build system for machines that meet
the Python requirements.
Before this CL, the web archive had two folders: "public" (which
contained web demos written in C++) and "filamentjs" (for the barebones
WASM).
After this CL, the web archive will instead have "dist" and "docs". The
dist folder will have the WASM and accompanying JS file, while the docs
folder has the tutorials and their accompanying demos.
If your machine has Python 3 installed, then "build -ap webgl" will
attempt to generate the JavaScript docs. If Python 3 isn't available,
this build step will be skipped. Note that our Kokoro macOS machines
already have Python 3 pre-installed.
Also removed the pipenv file to simplify the Kokoro Python environment.
Fixes#394.
This adds an archive step to `build.sh` and adds `build/web`.
The archive is a tgz that contains the contents of `public`, which only consists of the files needed for a simple static web server.
The files in `build/web` are almost identical to the mac build, except that they use the `/web/` path and install the emscripten SDK.
