Read script config if appropriate flag is specified, fix classpath handling

compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/K2JVMCompilerArguments.java

@@ -77,6 +77,9 @@ public class K2JVMCompilerArguments extends CommonCompilerArguments {
     @ValueDescription("<path>")
     public String declarationsOutputPath;
 
+    @Argument(value = "Xload-script-configs", description = "Load script configuration files from project directory tree")
+    public boolean loadScriptConfigs;
+
     // Paths to output directories for friend modules.
     public String[] friendPaths;