* replace implementation of fish-spec

provide a new implementation for fish-spec with more verbose and colored
output and more assertion functions

* fix indentation for fish-spec

* properly namespace color echo functions in fish-spec

* use line rewriting for fish-spec for more terse output

* use fish 3.0.0 compatible syntax

* fix assorted assertion bug

* ensure tests actually pass

* fix existing omf spec tests

* simplify assert_in_array and assert_not_in_array

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Co-authored-by: Kevin F. Konrad <kevin.konrad@skillbyte.de>