make new Fraction class more robust / generic

tweak tsconfig

Bump mixin-deep from 1.3.1 to 1.3.2

Bump lodash from 4.17.11 to 4.17.15

Bump handlebars from 4.1.2 to 4.5.3

Bumps [mixin-deep](https://github.com/jonschlinkert/mixin-deep) from 1.3.1 to 1.3.2.
- [Release notes](https://github.com/jonschlinkert/mixin-deep/releases)
- [Commits](https://github.com/jonschlinkert/mixin-deep/compare/1.3.1...1.3.2)
Signed-off-by: dependabot[bot] <support@github.com>

Bumps [lodash](https://github.com/lodash/lodash) from 4.17.11 to 4.17.15.
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](https://github.com/lodash/lodash/compare/4.17.11...4.17.15)
Signed-off-by: dependabot[bot] <support@github.com>

Bump eslint-utils from 1.3.1 to 1.4.3

Bumps [handlebars](https://github.com/wycats/handlebars.js) from 4.1.2 to 4.5.3.
- [Release notes](https://github.com/wycats/handlebars.js/releases)
- [Changelog](https://github.com/wycats/handlebars.js/blob/master/release-notes.md)
- [Commits](https://github.com/wycats/handlebars.js/compare/v4.1.2...v4.5.3)
Signed-off-by: dependabot[bot] <support@github.com>

Bumps [eslint-utils](https://github.com/mysticatea/eslint-utils) from 1.3.1 to 1.4.3.
- [Release notes](https://github.com/mysticatea/eslint-utils/releases)
- [Commits](https://github.com/mysticatea/eslint-utils/compare/v1.3.1...v1.4.3)
Signed-off-by: dependabot[bot] <support@github.com>

add transact logic

augment tests

further segment file structure

introduce orchestration