[nvda] revision 257 - single letter virtualBuffer navigation etc

Hi all,
This revision adds single letter navigation to virtualBuffers. This means that when in something like firefox or IE, you can just press h or shift+h which would move you backwards and forwards by heading. The below changelog lists all the letters that have been added.
Also some more fixes to outlook express / IE editable documents, and some fixups with translatable strings. 

The Changelog is as follows:
*Added single letter navigation keys to virtualBuffers. By themselves they move to the next element of that type, and with the shift key, they move to the previous.
Letters are: h=heading, p=paragraph, f=form field, t=table, l=list, i=list item, k=link
More may be added in the future, but I think these should be enough to start off with.
*Now the children property of NVDAObject_MSAA objects uses the accessibleChildren function from oleacc.dll to ask for all the children of an IAccessible, rather than manually going firstChild next [next ...]. A few bits of code (including mozilla gecko virtualBuffer rendering) uses the children property to walk the MSAA tree. Some say that this should make a speed improvement when using accessibleChildren.
*More fixes to internet explorer editable document navigation. Now backspace, delete and moveByCharacter scripts are overridden. Editing messages in outlook express seems to be a bit better now. Though I'm sure yet again I will find some bugs with this code.
*Added some more translatable strings, plus converted quite a few already existing ones to be in the form of string templates so that the person who translates them can have free reighn over where any values appear. 


Mick


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