Replace magic numbers with relevant constants v2

See merge request acubesat/obc/ecss-services!59

Append CRC to packets

See merge request acubesat/obc/ecss-services!55

ST[20] - Parameter Service overhaul

See merge request acubesat/obc/ecss-services!47

ParameterBase merely provides a virtual setter and getter, and also
acts as a common type which will be used to store pointers to Parameter
objects in an array, so as to enable ID-based parameter fetching and updating.

Rewrite of documentation and of the rest of the service is underway.

Merge branch 'ST-20-ParameterService-FP' of https://gitlab.com/acubesat/obc/ecss-services into ST-20-ParameterService-FP

Remove unused #includes

This MR removes some unneeded includes for C++ standard library files that cause code bloat for the MCU compiles.

See merge request acubesat/obc/ecss-services!53

Selective service compilation

Closes #35

See merge request acubesat/obc/ecss-services!52

Closes #35

MessageParser overhaul

This MR:
*  Changes the name of some `MessageParser` functions
*  Implements most of the **CCSDS space packet** and **ECSS TC & TM** headers, along with their tests
*  Adds documentation for all ECSS Definition constants
*  Removes template from all `Message::appendString()` functions
*  Add a `Message::appendMessage()` function

See merge request acubesat/obc/ecss-services!46

Fixes on warnings & errors

This MR performs a minor tidying of the ECSS-services repo:
*  Most doxygen warnings are fixed
*  Tests are now expected to return no errors, unless explicitly specified (Closes #19)

Note: !46 has to be merged before this.

See merge request acubesat/obc/ecss-services!48

Apply suggestion to src/Helpers/TimeAndDate.cpp

Add MessageParser tests

Apply suggestion to src/MessageParser.cpp

Fix documentation typo

Closes #19