Updated code

Code update to php 7.4

Update storage library

Update storage library - changes in tests

updated libraries, interfaces, paths style

Updated libraries and tests, added files package as source, use paths as array of strings

Update storage dependency

Update storage dependency to newer one

Formatting caches

Formatting the cache is outside the storage and inside cache - where it belongs better

Php8 support, testing

Remove php8 warnings, add badges and tests across the systems

Initial release

Initial release of kw_cache for kw_* project