We have been listing all the files to be included in the distributed
package in package.json:files. This is tedious and error prone. We
change to using globs instead, to do this without also including the
test and src files when outputting declarations we add a new typescript
config file for the declaration generation which excludes tests.
The new text features are faster and more ergonomic but not backwards
compatible. In order to make them backwards compatible re-expose the
original functionality and move the new API under a `future` export.
This allows users to interoperably use both implementations.
Continuing our theme of treating all languages equally, move
wrappers/javascript to javascrpit. Automerge libraries for new languages
should be built at this top level if possible.
