Improve script trains

src/main/java/nl/tudelft/submit/config/AsyncConfig.java

...in/java/nl/tudelft/submit/controller/GradeController.java

...n/java/nl/tudelft/submit/controller/ScriptController.java

...ft/submit/dto/create/script/ScriptFeedbackReceiveDTO.java

...tudelft/submit/dto/view/script/ScriptFeedbackViewDTO.java

...l/tudelft/submit/dto/view/script/ScriptResultViewDTO.java

...elft/submit/dto/view/script/ScriptTrainResultViewDTO.java

...nl/tudelft/submit/dto/view/script/ScriptTrainViewDTO.java

...java/nl/tudelft/submit/dto/view/script/ScriptViewDTO.java

...elft/submit/dto/view/script/ScriptWagonResultViewDTO.java

...nl/tudelft/submit/dto/view/script/ScriptWagonViewDTO.java

src/main/java/nl/tudelft/submit/enums/GradeCalculation.java

src/main/java/nl/tudelft/submit/enums/ScriptStatus.java

.../nl/tudelft/submit/exception/InvalidFormulaException.java

src/main/java/nl/tudelft/submit/model/Version.java

src/main/java/nl/tudelft/submit/model/grading/GradePart.java

.../nl/tudelft/submit/model/script/AbstractScriptResult.java

src/main/java/nl/tudelft/submit/model/script/Script.java

...n/java/nl/tudelft/submit/model/script/ScriptFeedback.java

...ain/java/nl/tudelft/submit/model/script/ScriptResult.java