Remove deprecated HasTraits.get and HasTraits.set methods (#1738)

`HasTraits.get` and `HasTraits.set` were deprecated in 2014. Users
should use `trait_get` and `trait_set` instead.

## Checklist

- [x] Tests
- [x] Update API reference (`docs/source/traits_api_reference`)  - N/A
- [x] Update User manual (`docs/source/traits_user_manual`)  - N/A
- [x] Update type annotation hints in stub files

traits/has_traits.py

@@ -1417,13 +1417,6 @@ def trait_get(self, *names, **metadata):
 
         return result
 
-    # Defines the deprecated alias for 'trait_get'
-    @deprecated('use "HasTraits.trait_get" instead')
-    def get(self, *names, **metadata):
-        return self.trait_get(*names, **metadata)
-
-    get.__doc__ = trait_get.__doc__
-
     def trait_set(self, trait_change_notify=True, **traits):
         """ Shortcut for setting object trait attributes.
 
@@ -1468,15 +1461,6 @@ def trait_set(self, trait_change_notify=True, **traits):
 
         return self
 
-    # Defines the deprecated alias for 'trait_set'
-    @deprecated('use "HasTraits.trait_set" instead')
-    def set(self, trait_change_notify=True, **traits):
-        return self.trait_set(
-            trait_change_notify=trait_change_notify, **traits
-        )
-
-    set.__doc__ = trait_set.__doc__
-
     def trait_setq(self, **traits):
         """ Shortcut for setting object trait attributes.
 

traits/has_traits.pyi

@@ -72,9 +72,7 @@ class HasTraits(CHasTraits, metaclass=MetaHasTraits):
     def has_traits_interface(self, *interfaces: _Any): ...
     def __reduce_ex__(self, protocol: _Any): ...
     def trait_get(self, *names: _Any, **metadata: _Any): ...
-    def get(self, *names: _Any, **metadata: _Any): ...
     def trait_set(self, trait_change_notify: bool = ..., **traits: _Any): ...
-    def set(self, trait_change_notify: bool = ..., **traits: _Any): ...
     def trait_setq(self, **traits: _Any): ...
     def reset_traits(self, traits: Optional[_Any] = ..., **metadata: _Any): ...
     def copyable_trait_names(self, **metadata: _Any): ...

traits/tests/test_trait_get_set.py

@@ -37,31 +37,10 @@ def test_trait_get(self):
         values = obj.trait_get("string", "integer")
         self.assertEqual(values, {"string": "foo", "integer": 0})
 
-    def test_trait_set_deprecated(self):
-        obj = TraitsObject()
-
-        with self.assertNotDeprecated():
-            obj.trait_set(integer=1)
-
-        with self.assertDeprecated():
-            obj.set(string="foo")
-
-        self.assertEqual(obj.string, "foo")
-        self.assertEqual(obj.integer, 1)
-
-    def test_trait_get_deprecated(self):
-        obj = TraitsObject()
-        obj.string = "foo"
         obj.integer = 1
-
-        with self.assertNotDeprecated():
-            values = obj.trait_get("integer")
+        values = obj.trait_get("integer")
         self.assertEqual(values, {"integer": 1})
 
-        with self.assertDeprecated():
-            values = obj.get("string")
-        self.assertEqual(values, {"string": "foo"})
-
     def test_trait_set_quiet(self):
         obj = TraitsObject()
         obj.string = "foo"