Rename platform to header.

compiler/testData/multiplatform/classScopes/constructorIncorrectSignature/common.kt

@@ -1,3 +1,3 @@
-platform class Foo {
+header class Foo {
     constructor(s: String)
 }

compiler/testData/multiplatform/classScopes/constructorIncorrectSignature/output.txt

@@ -5,7 +5,7 @@ Output:
 -- JVM --
 Exit code: COMPILATION_ERROR
 Output:
-compiler/testData/multiplatform/classScopes/constructorIncorrectSignature/common.kt:1:16: error: no definition is found for platform declaration 'Foo'
+compiler/testData/multiplatform/classScopes/constructorIncorrectSignature/common.kt:1:14: error: no implementation is found for header declaration 'Foo'
 The following declaration is incompatible because some members are not implemented.
 No implementations are found for members listed below:
 
@@ -14,8 +14,8 @@ No implementations are found for members listed below:
     The following declaration is incompatible because parameter types are different:
         public constructor Foo(s: Array<String>)
 
-platform class Foo {
-               ^
+header class Foo {
+             ^
 compiler/testData/multiplatform/classScopes/constructorIncorrectSignature/jvm.kt:1:1: error: modifier 'impl' is only applicable to members that are initially declared in platform-independent code
 impl class Foo {
 ^

compiler/testData/multiplatform/classScopes/fakeOverrides/common.kt

@@ -1,7 +1,7 @@
-platform open class Base {
+header open class Base {
     fun base()
 }
 
-platform class Derived : Base {
+header class Derived : Base {
     fun derived()
 }

compiler/testData/multiplatform/classScopes/functionIncorrectSignature/common.kt

@@ -1,3 +1,3 @@
-platform class Foo {
+header class Foo {
     fun function(b: ByteArray): Int
 }

compiler/testData/multiplatform/classScopes/functionIncorrectSignature/output.txt

@@ -5,17 +5,17 @@ Output:
 -- JVM --
 Exit code: COMPILATION_ERROR
 Output:
-compiler/testData/multiplatform/classScopes/functionIncorrectSignature/common.kt:1:16: error: no definition is found for platform declaration 'Foo'
+compiler/testData/multiplatform/classScopes/functionIncorrectSignature/common.kt:1:14: error: no implementation is found for header declaration 'Foo'
 The following declaration is incompatible because some members are not implemented.
 No implementations are found for members listed below:
 
-    public final platform fun function(b: ByteArray): Int
+    public final header fun function(b: ByteArray): Int
 
     The following declaration is incompatible because return type is different:
         public final impl fun function(b: ByteArray): Long
 
-platform class Foo {
-               ^
+header class Foo {
+             ^
 compiler/testData/multiplatform/classScopes/functionIncorrectSignature/jvm.kt:1:1: error: modifier 'impl' is only applicable to members that are initially declared in platform-independent code
 impl class Foo {
 ^

compiler/testData/multiplatform/classScopes/missingConstructor/common.kt

@@ -1,3 +1,3 @@
-platform class Foo {
+header class Foo {
     constructor(s: String)
 }

compiler/testData/multiplatform/classScopes/missingConstructor/output.txt

@@ -5,7 +5,7 @@ Output:
 -- JVM --
 Exit code: COMPILATION_ERROR
 Output:
-compiler/testData/multiplatform/classScopes/missingConstructor/common.kt:1:16: error: no definition is found for platform declaration 'Foo'
+compiler/testData/multiplatform/classScopes/missingConstructor/common.kt:1:14: error: no implementation is found for header declaration 'Foo'
 The following declaration is incompatible because some members are not implemented.
 No implementations are found for members listed below:
 
@@ -14,8 +14,8 @@ No implementations are found for members listed below:
     The following declaration is incompatible because number of value parameters is different:
         public constructor Foo()
 
-platform class Foo {
-               ^
+header class Foo {
+             ^
 compiler/testData/multiplatform/classScopes/missingConstructor/jvm.kt:1:1: error: modifier 'impl' is only applicable to members that are initially declared in platform-independent code
 impl class Foo
 ^

compiler/testData/multiplatform/classScopes/missingFunction/common.kt

@@ -1,3 +1,3 @@
-platform class Foo {
+header class Foo {
     fun function(s: String)
 }

compiler/testData/multiplatform/classScopes/missingFunction/output.txt

@@ -5,14 +5,14 @@ Output:
 -- JVM --
 Exit code: COMPILATION_ERROR
 Output:
-compiler/testData/multiplatform/classScopes/missingFunction/common.kt:1:16: error: no definition is found for platform declaration 'Foo'
+compiler/testData/multiplatform/classScopes/missingFunction/common.kt:1:14: error: no implementation is found for header declaration 'Foo'
 The following declaration is incompatible because some members are not implemented.
 No implementations are found for members listed below:
 
-    public final platform fun function(s: String): Unit
+    public final header fun function(s: String): Unit
 
-platform class Foo {
-               ^
+header class Foo {
+             ^
 compiler/testData/multiplatform/classScopes/missingFunction/jvm.kt:1:1: error: modifier 'impl' is only applicable to members that are initially declared in platform-independent code
 impl class Foo
 ^

compiler/testData/multiplatform/classScopes/simple/common.kt

@@ -1,4 +1,4 @@
-platform class Foo(param: String) {
+header class Foo(param: String) {
     var property: Int
 
     fun <T> function(p: List<T>): T