Changed comments

- changed variable names
- added breaks
- corrected a comment
- deleted explicit declaration of true/false in ifs
- fixed a bug in tests caused by passing the message by reference

- Added a new variable eventActionDefinitionID
- Added the size of the multimap as #define in ECSS_Definitions.hpp

Changed passing by value messages with pass by reference messages

Completed functions in EventActionService

Added test basics

Added test basics