Implement support for new script customizations in command line compiler

refactor and fix internals in many places to make it work
add appropriate tests for main-kts case

libraries/scripting/common/src/kotlin/script/experimental/api/scriptCompilation.kt

@@ -35,21 +35,23 @@ open class ScriptCompilationConfiguration(baseConfigurations: Iterable<ScriptCom
 
     object Default : ScriptCompilationConfiguration()
 
-    /**
-     * An alternative to the constructor with base configuration, which returns a new configuration only if [body] adds anything
-     * to the original one, otherwise returns original
-     */
-    fun withUpdates(body: Builder.() -> Unit = {}): ScriptCompilationConfiguration {
-        val newConfiguration = ScriptCompilationConfiguration(this, body = body)
-        return if (newConfiguration == this) this
-        else newConfiguration
-    }
-
     override fun toString(): String {
         return "ScriptCompilationConfiguration($providedProperties)"
     }
 }
 
+
+/**
+ * An alternative to the constructor with base configuration, which returns a new configuration only if [body] adds anything
+ * to the original one, otherwise returns original
+ */
+fun ScriptCompilationConfiguration?.with(body: ScriptCompilationConfiguration.Builder.() -> Unit): ScriptCompilationConfiguration {
+    val newConfiguration =
+        if (this == null) ScriptCompilationConfiguration(body = body)
+        else ScriptCompilationConfiguration(this, body = body)
+    return if (newConfiguration == this) this else newConfiguration
+}
+
 /**
  * The script type display name
  */

libraries/scripting/common/src/kotlin/script/experimental/api/scriptEvaluation.kt

@@ -35,6 +35,18 @@ open class ScriptEvaluationConfiguration(baseEvaluationConfigurations: Iterable<
     object Default : ScriptEvaluationConfiguration()
 }
 
+/**
+ * An alternative to the constructor with base configuration, which returns a new configuration only if [body] adds anything
+ * to the original one, otherwise returns original
+ */
+fun ScriptEvaluationConfiguration?.with(body: ScriptEvaluationConfiguration.Builder.() -> Unit): ScriptEvaluationConfiguration {
+    val newConfiguration =
+        if (this == null) ScriptEvaluationConfiguration(body = body)
+        else ScriptEvaluationConfiguration(this, body = body)
+    return if (newConfiguration != this) newConfiguration else this
+}
+
+
 /**
  * The list of actual script implicit receiver object, in the same order as specified in {@link ScriptCompilationConfigurationKeys#implicitReceivers}
  */