Merge pull request #976 from rsvato/master

[RJA-2301][feature] - Hypermedia links to attachments collection
[RJA-2372][fix]: Made file attachments serializable
to be possible to send them in remote action result(from agent to backend).
Merge pull request #977 from ddurnev/master

[RJA-2372][fix]: Made file attachments serializable
[RJA-2342][fix]: Fail step execution in case of unexpected exception
in action executor actor
[RJA-2351][feature]: Modify existing scheduling to support recurrency.
Merge pull request #978 from ddurnev/master

[RJA-2342][fix]: Fail step execution in case of unexpected exception
[RJA-2309][feature]: Enhance scheduler- recurrence.
Added interval schedule expressions.
Merge pull request #979 from ddurnev/scheduler

[RJA-2351][feature]: Modify existing scheduling to support recurrency.
[RJA-2385][fix] - Genesis is unable to find the group with Domain Local scope in AD