Increase API wrapper coverage

It now wraps everything except the Error class, which is intentionally
left unwrapped, as wrapping it would provide no benefit.

docs/reference.rst

@@ -2,25 +2,47 @@
 API Reference
 *************
 
-As this API is just a wrapper for LOOT's C++ API, its documentation is linked to for all non-Python-specific information.
+As this API is just a wrapper for LOOT's C++ API, its documentation is linked to
+for all non-Python-specific information.
 
 Enumerations
 ============
 
+The wrapped enumeration types below are classes in Python, but the distinction
+makes no difference in practice, so they're grouped here for semantics.
+
 .. autoclass:: loot_api.GameType
    :members:
+   :undoc-members:
+
+.. autoclass:: loot_api.LanguageCode
+   :members:
+   :undoc-members:
 
 .. autoclass:: loot_api.MessageType
    :members:
+   :undoc-members:
+
+.. autoclass:: loot_api.PluginCleanliness
+   :members:
+   :undoc-members:
 
 Public-Field Data Structures
 ============================
 
+Classes with public fields and no member functions.
+
+.. autoclass:: loot_api.MasterlistInfo
+   :members:
+   :undoc-members:
+
 .. autoclass:: loot_api.Message
    :members:
+   :undoc-members:
 
 .. autoclass:: loot_api.PluginTags
    :members:
+   :undoc-members:
 
 
 Functions
@@ -38,3 +60,4 @@ Classes
 
 .. autoclass:: loot_api.Version
    :members:
+   :undoc-members: