Haketilo

change copyright notice of js-sha256 code to be exactly the same as in upstream's LICENSE.txt

• common/sha256.js: removed email address from the copyright line

assume and use "$schema" properties in item definitions

fix loading initial data and verify it in automated tests

change store names and data keys to singular

restore chromium support

adapt to changes in file path format

From now on we assume Hydrilla serves file contents at 'file/sha256/' instead of 'file/sha256-'.
With this commit we also stop using the "hash_key" property internally.

more improvements for abrowser&librewolf

add support for testing with other browsers (especially Abrowser and Librewolf)

There are still some spurious failures when running under those newer browsers. Those will be systematically investigated and fixed.

make Haketilo buildable again (for Mozilla)

How cool it is to throw away 5755 lines of code...

update error reporting in popup