Rename KClass.properties and extensionProperties: prepend 'member'

To better emphasize the fact that all returned properties require an instance
of the class they are declared in. Another issue was that
'Some::class.extensionProperties' was sometimes incorrectly perceived as
"get all extension properties available on the class Some"

compiler/testData/codegen/boxWithStdlib/reflection/properties/allVsDeclared.kt

@@ -14,10 +14,10 @@ class Sub : Super() {
 fun box(): String {
     val sub = Sub::class
 
-    assertEquals(listOf("a", "c"), sub.properties.map { it.name }.sort())
-    assertEquals(listOf("b", "d"), sub.extensionProperties.map { it.name }.sort())
-    assertEquals(listOf("c"), sub.declaredProperties.map { it.name })
-    assertEquals(listOf("d"), sub.declaredExtensionProperties.map { it.name })
+    assertEquals(listOf("a", "c"), sub.memberProperties.map { it.name }.sort())
+    assertEquals(listOf("b", "d"), sub.memberExtensionProperties.map { it.name }.sort())
+    assertEquals(listOf("c"), sub.declaredMemberProperties.map { it.name })
+    assertEquals(listOf("d"), sub.declaredMemberExtensionProperties.map { it.name })
 
     return "OK"
 }