Report a warning or error if an old language version or API version is used

#KT-25823 Fixed

compiler/util/src/org/jetbrains/kotlin/config/LanguageVersionSettings.kt

@@ -213,6 +213,9 @@ enum class LanguageVersion(val major: Int, val minor: Int) : DescriptionAware {
         fun fromFullVersionString(str: String) =
             str.split(".", "-").let { if (it.size >= 2) fromVersionString("${it[0]}.${it[1]}") else null }
 
+        @JvmField
+        val FIRST_SUPPORTED = KOTLIN_1_2
+
         @JvmField
         val LATEST_STABLE = KOTLIN_1_3
     }