Collection of a number of changes (#2286)

* Cleanup Property code
* Remove NOLINT statements
* Return Property class types as string_view
* Remove getStringValue function
* Simplify string value retrieval
* Ensure that image paths in the ImageSequenceTileProvider are sorted (closes #2205)
* Some cleanup of OpenSpaceEngine
* Cleanup documentation
* Some more cleanup of engine classes
* Some more cleanup
* Update SGCT repository
* Use new Jenkins node identifiers as the old method broke with update

src/rendering/transferfunction.cpp

@@ -50,7 +50,7 @@ TransferFunction::TransferFunction(const std::string& filepath,
     setCallback(std::move(tfChangedCallback));
 }
 
-TransferFunction::~TransferFunction() {} // NOLINT
+TransferFunction::~TransferFunction() {}
 
 void TransferFunction::setPath(const std::string& filepath) {
     if (_file) {