A module's inspection (used e.g. generate a description of an RSpec
example) has been improved to now include the module's name, which
identifies the module better than the previous string.

Old: `#<Module:0x0000000107f7a0a0>`
New (e.g.): `SuperDiff::Test`.

Closes #255.

Fixes #184.

Fix for #154.

Adds a RangeObject inspection tree builder so Range objects are printed as strings, like this:

```
(1..2)
```

instead of as default objects:
```
#<Range:0x123456 ...
```

---------

Co-authored-by: Joe Stein <[email protected]>

This project currently has three language dependencies for development:

* Ruby, for the library code and testing
* Javascript, for linting with Prettier and installing commit hooks with
Husky
* Python, for creating the docsite

In an effort to reduce these dependencies, I'm moving to eliminate JS
from the dev environment, starting with Prettier. I may replace Husky
with Overcommit or a bespoke script.

# PR Summary
Commit fc418c1 changed the location of
`inspection_tree.rb`. This PR adjusts sources to changes.

Signed-off-by: Emmanuel Ferdman <[email protected]>

Integration tests without Zeus are very slow because we run each example
in a new process, which has to load all dependencies and frameworks –
like RSpec, SuperDiff, ActiveSupport, etc – from scratch.

Zeus improved on this, but has a client-server architecture and has been
proving somewhat difficult to use. If we instead load the dependencies
and then run RSpec in a new
[_forked_](https://man7.org/linux/man-pages/man2/fork.2.html)
subprocess, we don't have to reload anything loaded before fork time,
and don't have to use Zeus.

Light testing shows a ~5x speed-up over non-Zeus integration tests.

Closes #268.

SuperDiff already skips diff output for incomparable types, such as `true`, `false`, and `nil`. We will now also skip diff output when comparing the following types (for which we can't produce a meaningful diff):

* `Symbol`
* `Numeric`
* `Regexp`
* `Class`
* `Module`