Refactor getting dependencies for script files API

Deprecate KotlinScriptDefinition#getDependenciesFor
Expose dependencyResolver as a property
KotlinScriptExternalImportsProvider is the component clients should be asking for dependencies

compiler/cli/src/org/jetbrains/kotlin/cli/jvm/K2JVMCompiler.kt

@@ -463,7 +463,7 @@ class K2JVMCompiler : CLICompiler<K2JVMCompilerArguments>() {
                         messageCollector.report(
                                 INFO,
                                 "Added script definition $template to configuration: files pattern = \"${def.scriptFilePattern}\", " +
-                                "resolver = ${def.resolver?.javaClass?.name}"
+                                "resolver = ${def.dependencyResolver.javaClass.name}"
                         )
                     }
                     catch (ex: ClassNotFoundException) {

compiler/cli/src/org/jetbrains/kotlin/cli/jvm/compiler/KotlinCoreEnvironment.kt

@@ -187,7 +187,7 @@ class KotlinCoreEnvironment private constructor(
 
             KotlinScriptExternalImportsProvider.getInstance(project)?.let { importsProvider ->
                 configuration.addJvmClasspathRoots(
-                        sourceFiles.mapNotNull(importsProvider::getExternalImports)
+                        sourceFiles.mapNotNull(importsProvider::getScriptDependencies)
                                 .flatMap { it.classpath }
                                 .distinctBy { it.absolutePath })
             }

compiler/cli/src/org/jetbrains/kotlin/cli/jvm/repl/GenericReplCompiler.kt

@@ -33,6 +33,7 @@ import org.jetbrains.kotlin.psi.KtScriptInitializer
 import org.jetbrains.kotlin.psi.psiUtil.getChildOfType
 import org.jetbrains.kotlin.renderer.DescriptorRenderer
 import org.jetbrains.kotlin.script.KotlinScriptDefinition
+import org.jetbrains.kotlin.script.KotlinScriptExternalImportsProvider
 import java.io.File
 import java.util.concurrent.locks.ReentrantReadWriteLock
 import kotlin.concurrent.write
@@ -67,7 +68,7 @@ open class GenericReplCompiler(disposable: Disposable,
                 Pair(compilerState.lastLineState!!.psiFile, compilerState.lastLineState!!.errorHolder)
             }
 
-            val newDependencies = scriptDefinition.getDependenciesFor(psiFile, checker.environment.project, compilerState.lastDependencies)
+            val newDependencies = KotlinScriptExternalImportsProvider.getInstance(checker.environment.project).getScriptDependencies(psiFile)
             var classpathAddendum: List<File>? = null
             if (compilerState.lastDependencies != newDependencies) {
                 compilerState.lastDependencies = newDependencies