Wizard: add descriptions for settings

libraries/tools/new-project-wizard/src/org/jetbrains/kotlin/tools/projectWizard/core/entity/settings/Setting.kt

@@ -20,6 +20,7 @@ typealias AnySetting = Setting<*, *>
 
 interface Setting<out V : Any, out T : SettingType<V>> : Entity, ActivityCheckerOwner, Validatable<V> {
     val title: String
+    val description: String?
     val defaultValue: SettingDefaultValue<V>?
     val isRequired: Boolean
     val isSavable: Boolean
@@ -31,6 +32,7 @@ interface Setting<out V : Any, out T : SettingType<V>> : Entity, ActivityChecker
 data class InternalSetting<out V : Any, out T : SettingType<V>>(
     override val path: String,
     override val title: String,
+    override val description: String?,
     override val defaultValue: SettingDefaultValue<V>?,
     override val isAvailable: Checker,
     override val isRequired: Boolean,

libraries/tools/new-project-wizard/src/org/jetbrains/kotlin/tools/projectWizard/core/entity/settings/SettingBuilder.kt

@@ -23,6 +23,7 @@ abstract class SettingBuilder<V : Any, T : SettingType<V>>(
     var validateOnProjectCreation = true
     var isSavable: Boolean = false
     var isRequired: Boolean? = null
+    var description: String? = null
 
     fun value(value: V) = SettingDefaultValue.Value(value)
     fun dynamic(getter: Reader.(SettingReference<V, SettingType<V>>) -> V?) =
@@ -47,6 +48,7 @@ abstract class SettingBuilder<V : Any, T : SettingType<V>>(
     fun buildInternal() = InternalSetting(
         path = path,
         title = title,
+        description = description,
         defaultValue = defaultValue,
         isAvailable = isAvailable,
         isRequired = isRequired ?: (defaultValue == null),