Big docs cleanup.

* Fixed headers including:
  - All rights reserved not All Rights Reserved.
  - name, [email protected] not name <[email protected]>
  - tabs and spaces
  - Authors: not Documented by:
* Renamed string.dox to String.dox
* Renamed midixxx.dox files to MidiXxx.dox
* Moved images into images subdirectories and updated Doxfile.
* Re-format all files with tabs instead of spaces.
* Fix many spelling mistakes.
* Added all files, classes, structs, and enums to libbe group.

docs/user/interface/Dragger.dox

@@ -1,8 +1,8 @@
 /*
- * Copyright 2012 Haiku inc.
+ * Copyright 2011 Haiku Inc. All rights reserved.
  * Distributed under the terms of the MIT License.
  *
- * Documentation by:
+ * Authors:
  *		John Scipione, [email protected]
  *
  * Corresponds to:
@@ -12,6 +12,8 @@
 
 /*!
 	\file Dragger.h
+	\ingroup interface
+	\ingroup libbe
 	\brief Provides the BDragger class.
 */