Delete Hashable, pull up its members to Any

Extensions on nullable types remain in Library.kt

 #KT-1741 Obsolete
 #KT-2805 Obsolete
 #KT-1365 Fixed
 #KT-4517 In Progress

compiler/testData/diagnostics/tests/cast/IsErasedAllowFromOut.kt

@@ -1 +1 @@
-fun f(a: MutableList<out Number>) = a is MutableList<out Hashable>
+fun f(a: MutableList<out Number>) = a is MutableList<out Any>

compiler/testData/diagnostics/tests/cast/IsErasedAllowFromOutAtClass.kt

@@ -1 +1 @@
-fun f(a: List<Number>) = a is List<Hashable>
+fun f(a: List<Number>) = a is List<Any>

compiler/testData/diagnostics/tests/cast/IsErasedDisallowFromOutAtClass.kt

@@ -1 +1 @@
-fun f(a: List<Hashable>) = a is <!CANNOT_CHECK_FOR_ERASED!>List<Number><!>
+fun f(a: List<Any>) = a is <!CANNOT_CHECK_FOR_ERASED!>List<Number><!>