[Echo.Control] implement _merge functionality for different manifest types
Echo.Events - context generation is now a part of the Echo.Events library interface (F:822)
Echo.Auth - unit test fixed (the "defaults" field reference updated to the _manifest() function call)
Echo.Control - "context" is now processed via config normalizer
Echo.Events - minor documentation typo fixed
Echo.Control - adding a comment about the "context" field normalization + adding "context" to the list of the auto-populated fields inside the Echo.App class
[Echo.Control]
- refactor merge mechanism + tests;
Fixed tests & bugs after context generating refactor