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/call/privateProperty.kt

@@ -7,7 +7,7 @@ class A(private var result: String)
 fun box(): String {
     val a = A("abc")
 
-    val p = A::class.declaredProperties.single() as KMutableProperty1<A, String>
+    val p = A::class.declaredMemberProperties.single() as KMutableProperty1<A, String>
     p.accessible = true
     assertEquals("abc", p.call(a))
     assertEquals(Unit, p.setter.call(a, "def"))

compiler/testData/codegen/boxWithStdlib/reflection/call/propertyAccessors.kt

@@ -26,7 +26,7 @@ fun box(): String {
     assertEquals(1, (::p0).getter.call())
     assertEquals(2, (Int::p1).call(2))
     assertEquals(2, (Int::p1).getter.call(2))
-    val p2 = A::class.extensionProperties.single()
+    val p2 = A::class.memberExtensionProperties.single()
     assertEquals(3, p2.call(A(), 3))
     assertEquals(3, p2.getter.call(A(), 3))
 
@@ -34,7 +34,7 @@ fun box(): String {
     assertEquals(1, (::mp0).getter.call())
     assertEquals(2, (Int::mp1).call(2))
     assertEquals(2, (Int::mp1).getter.call(2))
-    val mp2 = B::class.extensionProperties.single() as KMutableProperty2
+    val mp2 = B::class.memberExtensionProperties.single() as KMutableProperty2
     assertEquals(3, mp2.call(B(), 3))
     assertEquals(3, mp2.getter.call(B(), 3))