Reconsider license name patterns

[AugustusKling]

Is your feature request related to a problem? Please describe.

Not sure if current patterns for license files match all files they should match. Same for lookup table of MIME types.

Describe the solution you'd like

Try out different patterns and check if additional, valid license files are found in commonly used NPM packages. Then decide if the current pattern in #LICENSE_FILENAME_PATTERN and MAP_TEXT_EXTENSION_MIME are good as they are or need to be changed.