Corean characters fix

Included in this release:

• Fixed Diff::splitLines() breaking corean characters (#4).

Unicode fix

Included in this release:

• Unicode characters are now correctly recognized.
• Added public Diff::splitLines() method.
• Added public Diff::splitCharacters() method.
• Switched to an MIT license.

PHP7.4 Release

Included in this release:

• Upgraded the code to PHP 7.4 style.
• Loosened the mistralys/application-utils version constraint.
• Now including unit tests in PHPStan analysis.
• Fixed PHPStan recommendations.
• All classes now use strict typing.
• Added this changelog file.
• Upgraded unit tests with namespaces and expected naming scheme.

Initial featureset release.

1.0.0

Replaced scrutinizer icon with the rating icon.