added tests and fixed bugs

build.gradle.kts

src/main/kotlin/b/language/server/App.kt

src/main/kotlin/b/language/server/BDocumentService.kt

src/main/kotlin/b/language/server/ProBInterface.kt

src/main/kotlin/b/language/server/ProblemHandler.kt

src/main/kotlin/b/language/server/Server.kt

src/main/kotlin/b/language/server/Util.kt

src/main/kotlin/b/language/server/dataStorage/Position.kt

src/main/kotlin/b/language/server/dataStorage/Problem.kt

...erver/proBMangement/CommandCouldNotBeExecutedException.kt

...ge/server/proBMangement/PathCouldNotBeCreatedException.kt

.../b/language/server/proBMangement/ProBCommandLineAccess.kt

...n/kotlin/b/language/server/proBMangement/ProBInterface.kt

src/test/kotlin/b/language/server/AppTest.kt

src/test/kotlin/b/language/server/ProBCommandLineTest.kt