Document the classes hierarchy

Author: dregad

docs/Classes.md

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+# Source Integration Plugin classes hierarchy
+
+## Plugin classes
+
+- **MantisSourceBase** extends MantisPlugin
+    - **SourcePlugin** - The Source Integration plugin
+    - **SourceIntegrationPlugin** - A child plugin for *Source* that handles 
+      integration with the MantisBT UI 
+    - **MantisSourcePlugin** - Abstract base class for VCS-specific plugins
+        - **SourceGenericPlugin**
+        - **SourceBitBucketPlugin**
+        - **SourceCgitPlugin**
+        - **SourceGithubPlugin**
+        - **SourceGitlabPlugin**
+        - **SourceGitwebPlugin**
+        - **SourceHgWebPlugin**
+        - **SourceSVNPlugin** Subversion and derivatives
+            - **SourceSFSVNPlugin**
+            - **SourceViewVCPlugin**
+            - **SourceWebSVNPlugin**
+
+## Helper classes
+
+- **SourceChangeset**
+- **SourceRelatedChangesetsColumn** extends MantisColumn
+- **SourceFile**
+- **SourceFilter**
+- **SourceFilterOption**
+- **SourceMapping**
+- **SourceRepo**
+- **SourceUser**
+- **SourceVCS**
+- **SourceVCSWrapper**