Added SHA256Worker implementation with web worker support and fallback.
Just an axample use of SHA256Worker
Merge branch 'development' into sha256-custom
Moved ssh256 into separate package
Chunk processing feature added, web worker only
Minor cleanup in sha256 worker.
Finished support for chunks in fallback worker and unordered chunks buffering
Icons added for entities and sorting
Added test file for sha256 package and moved crypto into sha256 package
Person and group generic entitiy templates
Groups filtering server side and infinite scroll

Partially implements #444
Server side sorting added

Still missing a user interface to select what to sort by.
Separated server from client SHA256Worker
Minor bug fix
Sorting UI implemented on client
Refactored entity listings
Implemented sha256 functionality in Crypto
Started working on tests for Crypto
Adding mistakenly moved results
Default sorting by activity in groups. Fixes #437

Still needs to have real last activity implemented. Currently updatedAt
is used.