A language server for Bjolang

Runs the compiler in-process against the Bjolang checkout beside it, and
answers diagnostics, an outline, go to definition, hover and completion,
plus a request of its own for macro expansion.

Diagnostics come from the compiler's own check of the editor's text,
saved or not: on open, on save, and 400 ms after typing pauses. The
outline, definitions, hovers and completions read only as far as the
reader, with no type checking, so they answer on every request: the
top-level names of the file, its imports and the prelude, local names
from the binding forms the parser knows, the declarations and docs as
written, and the builtins with their types. emacs/bjolang-lsp.el shows a
macro call's expansion, one step or all of it, in a buffer.

test/smoke.py drives the server as an editor would.

🤖 Generated with [ECA](https://eca.dev)

Co-Authored-By: eca-agent <git@eca.dev>

.gitignore

@@ -0,0 +1,2 @@
+bin/
+obj/