This PR fixes name mangling to be unambiguous / injective by adding `00`
for disambiguation where necessary. Additionally, the inverse function,
`Lean.Name.unmangle` has been added which can be used to unmangle a
mangled identifier. This unmangler has been added to demonstrate the
injectivity but also to allow unmangling identifiers e.g. for debugging
purposes.
Closes#10724
This PR adds support for plugins to Lake. Precompiled modules are now
loaded as plugins rather than via `--load-dynlib`.
Additional plugins can be added through an experimental `plugins`
configuration option. The syntax for specifying this is not yet
convenient, and will be improved in future changes. A parallel `dynlibs`
configuration option has been added for specifying additional dynamic
libraries to build and pass to `--load-dynlib`.
This PR also changes the default directory for `.olean`, `.ilean`, and
module dynamic libraries (i.e., `leanLibDir`) to `lib/lean` instead of
the previous default of `lib`. This avoids potential name clashes
between single module shared libraries and the shared libraries of a
full `lean_lib`.
On non-Windows systems, module dynamic libraries are no longer linked to
their imports or external symbols. Symbols from those libraries are left
unresolved until load time. This avoids nesting these dependencies
within the shared library and means Lake no longer needs to augment the
shared library path to allow Lean to resolve such nested dependencies on
load.
