Remove support for xml-based script configs, other minor refactorings

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

@@ -98,9 +98,6 @@ 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;
-
     @Argument(value = "Xsingle-module", description = "Combine modules for source files and binary dependencies into a single module")
     public boolean singleModule;