remove support for 'trait' keyword

Original commit: 4ca434da54

jps/jps-plugin/src/org/jetbrains/kotlin/jps/build/KotlinJpsCompilerArgumentsProvider.kt

@@ -16,10 +16,10 @@
 
 package org.jetbrains.kotlin.jps.build
 
-import org.jetbrains.jps.incremental.ModuleBuildTarget
 import org.jetbrains.jps.incremental.CompileContext
+import org.jetbrains.jps.incremental.ModuleBuildTarget
 
-public trait KotlinJpsCompilerArgumentsProvider {
+public interface KotlinJpsCompilerArgumentsProvider {
     public fun getExtraArguments(moduleBuildTarget: ModuleBuildTarget, context: CompileContext): List<String>
     public fun getClasspath(moduleBuildTarget: ModuleBuildTarget, context: CompileContext): List<String>
 }

jps/jps-plugin/test/org/jetbrains/kotlin/jps/build/SimpleKotlinJpsBuildTest.kt

@@ -35,7 +35,7 @@ public class SimpleKotlinJpsBuildTest : AbstractKotlinJpsBuildTestCase() {
                                """
                                    package m1;
 
-                                   trait K {
+                                   interface K {
                                    }
                                """)
         createFile("m1/J.java",
@@ -53,7 +53,7 @@ public class SimpleKotlinJpsBuildTest : AbstractKotlinJpsBuildTestCase() {
                                     import m1.J;
                                     import m1.K;
 
-                                    trait M2: J {
+                                    interface M2: J {
                                         override fun bar(): K
                                     }
                                """)

jps/jps-plugin/testData/general/DependencyToOldKotlinLib/module/src/module/A.kt

@@ -1,6 +1,6 @@
 package module
 
-public trait A {
+public interface  A {
     fun oldFun(): Int = 1
     fun newFun(): Int = 42
 }

jps/jps-plugin/testData/general/DependencyToOldKotlinLib/oldModuleLib/src/module/A.kt

@@ -1,5 +1,5 @@
 package module
 
-public trait A {
+public interface A {
     fun oldFun(): Int = 1
 }

jps/jps-plugin/testData/incremental/pureKotlin/traitClassObjectConstantChanged/const.kt

@@ -1,6 +1,6 @@
 package test
 
-trait Trait {
+interface Trait {
     companion object {
         // Old and new constant values are different, but their hashes are the same
         val CONST = "BF"

jps/jps-plugin/testData/incremental/pureKotlin/traitClassObjectConstantChanged/const.kt.new

@@ -1,6 +1,6 @@
 package test
 
-trait Trait {
+interface Trait {
     companion object {
         // Old and new constant values are different, but their hashes are the same
         val CONST = "Ae"