Fixed names in ErrorHandler and enumeration of errors and removed explicit declaration of true or false in a CHECK

- Changed disableEventActionDefinition
according to the needs of multimap
- Added errors in ErrorHandler

- Changed deleteEventActionDefinition
according to the multimap needs

Changed the way add action-definition function works after rechecking the standard and updated the corresponding tests as well as added documentation in those tests

Added an error condition

Added tests for the spare field

Minor change in the documentation

Reimplement the spare field

Updated ErrorType enums in ExecutionStartErrorType and changed the corresponding errors in EventActionService.cpp

Wrote better tests, fixed code format, added tests in main for testing purposes and added FailedStartOfExecutionError in ErrorHandler

Closes #14
Closes #8