Add test library

[CorentinLepais]

Add library ThermofluidStream Test to include test models for components and models. These test models can test various things such as conditional connectors or configuration options.

A first implementation has been done by @tobolar here: https://github.com/tobolar/ThermofluidStream/tree/addLibrary_ThermofluidStreamTest

To-Do

• Test the models already implement by Jakub and validate if they work
• Move some of the test models in TFS which validate all versions of a component to TFS_Test
• Add new test models for the components without any. Simple test models which demonstrates the behaviour and test all the configurations are enough (e.g., Source → Compressor → Sink, Source → FlowResistance → Sink).
• Update the regression test repository with the new test results.

[tobolar]

@CorentinLepais Idea: To make things easier for you (and if desired), you can change unset tracked branch of your local copy of addLibrary_ThermofluidStreamTest (i.e. to brake the connection to my fork) and push it afterwards on the "origin" (https://github.com/DLR-SR/ThermofluidStream.git). This way, you will have the branch here on your original development and will be independent of my branch.
(Or let me know, I can perform this for you.)