JS: rename "-library-files" argument to "-libraries" and change separator

Use the system separator (':' or ';') instead of commas

 #KT-16083 Fixed

compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/K2JSCompilerArguments.java

@@ -35,9 +35,9 @@ public class K2JSCompilerArguments extends CommonCompilerArguments {
     @Argument(value = "no-stdlib", description = "Don't use bundled Kotlin stdlib")
     public boolean noStdlib;
 
-    @Argument(value = "library-files", description = "Path to zipped library sources or kotlin files separated by commas")
-    @ValueDescription("<path[,]>")
-    public String[] libraryFiles;
+    @Argument(value = "libraries", description = "Paths to Kotlin libraries with .meta.js and .kjsm files, separated by system file separator")
+    @ValueDescription("<path>")
+    public String libraries;
 
     @GradleOption(DefaultValues.BooleanFalseDefault.class)
     @Argument(value = "source-map", description = "Generate source map")