ICAR project structure reorganization

[ahokkonen]

ICAR project structure reorganization #66

• ICAR project structure reorganization according Splitting complex types, event-based types and code-based types (enums) into saparate sub-folders #66 (comment) proposal.

• url-schemes (url schemes)
• collections (added to separate collections)
• resources (resources exposed on API, references into types)
• types (message types, references into types or enums)
• enums (enumeration types)
• examples (examples)

• removed deprecated sources (DataLinker, JoinData)
• renamed icarMessagesType into icarMessageType
• minor refactoring, mainly JSON formatting

Please note, this pull request doesn't include changes discussed in this topic #66 (comment). It is good to have a separate task for that change (should be planned a bit more)