feat: refactor forms/grids/views/templates per wuttaweb compat

this starts to get things more aligned between wuttaweb and tailbone.
the use case in mind so far is for a wuttaweb view to be included in a
tailbone app.

form and grid classes now have some new methods to match wuttaweb, so
templates call the shared method names where possible.

templates can no longer assume they have tailbone-native master view,
form, grid etc. so must inspect context more closely in some cases.

tests/test_subscribers.py

@@ -0,0 +1,58 @@
+# -*- coding: utf-8; -*-
+
+from unittest.mock import MagicMock
+
+from pyramid import testing
+
+from tailbone import subscribers as mod
+from tests.util import DataTestCase
+
+
+class TestNewRequest(DataTestCase):
+
+    def setUp(self):
+        self.setup_db()
+        self.request = self.make_request()
+        self.pyramid_config = testing.setUp(request=self.request, settings={
+            'wutta_config': self.config,
+        })
+
+    def tearDown(self):
+        self.teardown_db()
+        testing.tearDown()
+
+    def make_request(self, **kwargs):
+        return testing.DummyRequest(**kwargs)
+
+    def make_event(self):
+        return MagicMock(request=self.request)
+
+    def test_continuum_remote_addr(self):
+        event = self.make_event()
+
+        # nothing happens
+        mod.new_request(event, session=self.session)
+        self.assertFalse(hasattr(self.session, 'continuum_remote_addr'))
+
+        # unless request has client_addr
+        self.request.client_addr = '127.0.0.1'
+        mod.new_request(event, session=self.session)
+        self.assertEqual(self.session.continuum_remote_addr, '127.0.0.1')
+
+    def test_register_component(self):
+        event = self.make_event()
+
+        # function added
+        self.assertFalse(hasattr(self.request, 'register_component'))
+        mod.new_request(event, session=self.session)
+        self.assertTrue(callable(self.request.register_component))
+
+        # call function
+        self.request.register_component('tailbone-datepicker', 'TailboneDatepicker')
+        self.assertEqual(self.request._tailbone_registered_components,
+                         {'tailbone-datepicker': 'TailboneDatepicker'})
+
+        # duplicate registration ignored
+        self.request.register_component('tailbone-datepicker', 'TailboneDatepicker')
+        self.assertEqual(self.request._tailbone_registered_components,
+                         {'tailbone-datepicker': 'TailboneDatepicker'})