Inconsistency between the required `fullFlexFile` and `flexFragmentFile` input formats

[kittaakos]

• flexFragmentFile requires a platform:/resource/ URI as a string.
• fullFlexFile requires a relative filesystem path: ./path/to/the/full/flex/file.flex as a string.

[kittaakos]

• relative filesystem path

Or absolute. /Users/you/path/to/the/full/flex/file.flex also works.