Closes #19

This reduces the size of the code from 208608 to 208072 bytes, which is
totally negligible

Update documentation for the ECSS definitions

Group Services and ECSS Definitions into a doxygen page

Use a non-templated version of etl::string

Set the etl format as a static variable for the Logger

This prevents wasting time recreating the format variable every time the
LOG function is called.

Force inlining the LOG function

This forces the compiler to check the `if constexpr` structure, and
disable the logging line entirely if needed.

Never redefine the log level

Move `disabled` logging level to ease level checks

Take care of MISRA and vera++ concerns

Switch order of execution to improve performance

Fix the build

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

- 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 comments in tests and changed a uint8_t to a uint16_t variable that counts the event action definitions in the eventActionStatusReport

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

# Conflicts:
#	CMakeLists.txt
#	src/Services/EventReportService.cpp

Remove unnecessary #define CATCH_CONFIG_MAIN to comply with the Catch2 tutorial, credits to @thodkatz for the catch (no pun intended :P)