Read the options of a project from catch3.json

A project can now keep the options it always wants in a catch3.json
instead of repeating them in every CTest, Bazel or CI command line.

Where it is found: the runner looks in the working directory and in each
directory above it, up to the root of the Git repository that holds the
working directory, and reads the nearest file. Outside a repository it
looks only in the working directory, so a stray file in a home directory
never applies. --config=FILE names a file instead (relative to the
working directory) and --no-config reads none; the last of the two wins.
Workers, --help and --version read no file, so a broken file never stands
in the way of help, and workers keep taking everything from their runner.

What it says: strict JSON with "version": 1 required and "$schema"
allowed for editors. The keys are the long options of the command line,
and each value becomes the arguments it stands for and goes through the
same parser, so there is one set of checks and one set of messages; the
file and the key are named in front of them. Values are typed: switches
take true (false for the negated adaptive-timeout and bisect), counts
take whole numbers, timeout and the confidence interval take numbers,
retries and seed take a number or a word, tests and warn take arrays,
verbosity takes quiet, normal or verbose, and history takes a path or
false. Paths are relative to the directory of the file. An unknown key is
an error with a suggestion when it is close to a known one; a key that
names an option for one run (shard, section, list, replay, ...) is told
that it belongs on the command line. Repeated keys are refused.

Precedence: the file's options are applied first and the command line on
top, so the command line wins; test specs on the command line replace the
file's tests instead of widening them with "or". --verbose names the file
that was read.

Options gains --config and --no-config, a ParseOptions overload that
starts from given options, and a public EditDistance for the suggestions.
The new ProjectConfig module holds the search, the key table and
ParseCommandLine, which Runner now calls in place of ParseOptions.

Tests cover the search (nearest file, the repository boundary, outside a
repository), every key, words and defaults, relative and absolute paths,
the messages for wrong files, precedence, --config, --no-config and the
modes that read no file. A fuzzer reads arbitrary file text and checks
that the worker arguments of the result parse again. The command line
reference, the runner guide and the release notes describe the file; the
amalgamated sources are regenerated.

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