(#15) FileResourceProvider: Prevent duplicate (simultaneous) requests to file listings
(#15) Use FileResourceProvider in PageLoader to avoid simultaneous duplicate requests to compositions
Merge branch 'feature/15-prevent-duplicate-requests-rebase'

* feature/15-prevent-duplicate-requests-rebase:
  (#15) Use FileResourceProvider in PageLoader to avoid simultaneous duplicate requests to compositions
  (#15) FileResourceProvider: Prevent duplicate (simultaneous) requests to file listings