[nvda] Revision 261 - coding changes

Hi all,

Revision 261 is more of a coding change, no new features or major fixes.
*Moved all constants out of constants.py in to their respective related places. For example: all the constants that come from winuser.h (for user32.dll) are now in winUser.py and all the oleacc.h constants are in MSAAHandler.py. Constants.py has now been deleted. This is a very major coding change so I may have missed a few here or there. Please report any bugs you find so they can be fixed. Even if they are really obvious. constants.py may come back if NVDA gains more global constants. But at this point in time, the only ones are exec constants used with core.executeFunction, so they were placed in core. 

*Fixed a few possible bugs and coding problems reported by pychecker.
*Added an 'isProtected' property to the base type NVDAObject. This property is used to check if things like password fields should be treeted as protected. And also changed the hasFocus method to a hasFocus property. This is so that api.py no longer has to check states specific to MSAA. Hopefully now no code outside an MSAA context references MSAA roles or states.
I am now going to be renaming modules such as MSAAHandler and the other MSAA modules so that they now talk about IAccessible, rather than MSAA. After this IAccessible2 code can start to be added in to those modules.
Note: Microsoft's MSAA implementation names MSAA's main interface as IAccessible so it is probably best that we talk about the super set of MSAA and IAccessible2 as IAccessible. 



Mick



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