#TwainForC#

###About TwainForC# This is the base TWAIN class. It's versioned so that developers can safely make a reference to it, if they don't want to actually include the TWAIN modules in their project.

###Our Goals - Make the interface better than raw TWAIN (like with C/C++), but don't go as far as making a toolkit. Expose as much of TWAIN as possible. Part of this involves making a CSV interface to abstract away some of the pain of the C/C++ structures, especially TW_CAPABILITY.

- Use type checking wherever possible.  This is why the TWAIN contants
	tend to be enumerations and why there are multiple entry points into
	the DSM_Entry function.
  
- Avoid unsafe code.  We use marshalling, and we're forced to use some
	unmanaged memory, but that's it.
  
- Run thread safe.  Force as many TWAIN calls into a single thread as
	possible.  The main exceptions are MSG_PROCESSEVENT and any of the
	calls that unwind the state machine (ex: MSG_DISABLEDS).  Otherwise
	all of the calls are serialized through a single thread.
  
- Avoid use of System.Windows content, so that the TWAIN assembly can be
	used as broadly as possible (specifically with Mono).
  
- Support all platforms.  The code currently works on 32-bit and 64-bit
	Windows.  It's been tested on 32-bit Linux and Mac OS X (using Mono).
	It should work as 64-bit on those platforms.  We're also supporting
	both TWAIN_32.DLL and TWAINDSM.DLL on Windows, and we'll support both
	TWAIN.framework and a TWAINDSM.framework (whenever it gets created).
  
- Virtualiaze all public functions so that developers can extended the
	class with a minimum of fuss.