feat: add basic email handler support

still no way to define "profiles" for admin in web app yet

docs/api/wuttjamaican/email.handler.rst

@@ -0,0 +1,6 @@
+
+``wuttjamaican.email.handler``
+==============================
+
+.. automodule:: wuttjamaican.email.handler
+   :members:

docs/api/wuttjamaican/email.message.rst

@@ -0,0 +1,6 @@
+
+``wuttjamaican.email.message``
+==============================
+
+.. automodule:: wuttjamaican.email.message
+   :members:

docs/api/wuttjamaican/email.rst

@@ -0,0 +1,6 @@
+
+``wuttjamaican.email``
+======================
+
+.. automodule:: wuttjamaican.email
+   :members:

docs/api/wuttjamaican/index.rst

@@ -17,6 +17,9 @@
    db.model.base
    db.model.upgrades
    db.sess
+   email
+   email.handler
+   email.message
    enum
    exc
    people

docs/glossary.rst

@@ -124,6 +124,12 @@ Glossary
      In practice this generally refers to a
      :class:`~wuttjamaican.db.sess.Session` instance.
 
+   email handler
+      The :term:`handler` responsible for sending email on behalf of
+      the :term:`app`.
+
+      Default is :class:`~wuttjamaican.email.handler.EmailHandler`.
+
    entry point
      This refers to a "setuptools-style" entry point specifically,
      which is a mechanism used to register "plugins" and the like.