Fix compiled scripts saving tests:

The tests were broken some time ago by applying script isolation, so
it was necessary to add base libraries into the classpath.
Also refactored some classpath building utilities.

libraries/scripting/jvm/src/kotlin/script/experimental/jvm/jvmScriptCompilation.kt

@@ -62,12 +62,12 @@ fun ScriptCompilationConfiguration.withUpdatedClasspath(classpath: Collection<Fi
     }
 }
 
-fun ScriptCompilationConfiguration.Builder.updateClasspath(classpath: Collection<File>) = updateClasspathImpl(classpath)
+fun ScriptCompilationConfiguration.Builder.updateClasspath(classpath: Collection<File>?) = updateClasspathImpl(classpath)
 
-fun JvmScriptCompilationConfigurationBuilder.updateClasspath(classpath: Collection<File>) = updateClasspathImpl(classpath)
+fun JvmScriptCompilationConfigurationBuilder.updateClasspath(classpath: Collection<File>?) = updateClasspathImpl(classpath)
 
-private fun PropertiesCollection.Builder.updateClasspathImpl(classpath: Collection<File>) {
-    val newClasspath = classpath.filterNewClasspath(this[ScriptCompilationConfiguration.dependencies])
+private fun PropertiesCollection.Builder.updateClasspathImpl(classpath: Collection<File>?) {
+    val newClasspath = classpath?.filterNewClasspath(this[ScriptCompilationConfiguration.dependencies])
         ?: return
 
     ScriptCompilationConfiguration.dependencies.append(JvmDependency(newClasspath))

libraries/scripting/jvm/src/kotlin/script/experimental/jvm/util/jvmClasspathUtil.kt

@@ -179,12 +179,14 @@ fun classpathFromClasspathProperty(): List<File>? =
 fun classpathFromClass(classLoader: ClassLoader, klass: KClass<out Any>): List<File>? =
     classpathFromFQN(classLoader, klass.qualifiedName!!)
 
+fun classpathFromClass(klass: KClass<out Any>): List<File>? =
+    classpathFromClass(klass.java.classLoader, klass)
+
+inline fun <reified T: Any> classpathFromClass(): List<File>? = classpathFromClass(T::class)
+
 fun classpathFromFQN(classLoader: ClassLoader, fqn: String): List<File>? {
     val clp = "${fqn.replace('.', '/')}.class"
-    val url = classLoader.getResource(clp)
-    return url?.toURI()?.path?.removeSuffix(clp)?.let {
-        listOf(File(it))
-    }
+    return classLoader.rawClassPathFromKeyResourcePath(clp).filter { it.isValidClasspathFile() }.toList().takeIf { it.isNotEmpty() }
 }
 
 fun File.matchMaybeVersionedFile(baseName: String) =
@@ -408,4 +410,11 @@ object KotlinJars {
             stdlibOrNull,
             scriptRuntimeOrNull
         ).filterNotNull()
+
+    val kotlinScriptStandardJarsWithReflect
+        get() = listOf(
+            stdlibOrNull,
+            scriptRuntimeOrNull,
+            reflectOrNull
+        ).filterNotNull()
 }