Make automatic say all in virtual buffers optional

[Hermann]

When you open a web page, NVDA automatically reads it.
Since modern web pages consist of a lot of repeating stuff - such as
navigation, Google search etc. - one has no need to be read this again and
again, each time you open a page or subpage.
When one needs to have read certain parts of the page, such as newspaper
articles, it is sufficient to use the SayAll? function.
So there should be an option to turn automatical reading off, and hear the
page announcements only, e.g. X links Y headings etc. and the percentage of
load while loading.

[jteh]

Link/heading counts, etc. is a separate issue.

Moving this into near-term, since quite a few people have requested it outside of this ticket.

[briang1]

The issue then becomes, do you make this function focus on the top of the page or what? If you are coming back to a page where the remembered positon is set, what action do you take and how do you tell its actually loaded?

At the moment, one very seldom hears the 100 percent of a page load, so the say all is the only indication all is well.

[mdcurran]

Implemented in changeset:main,4626.

[kevinchao89]

Excellent! This is working very nicely in Snapshot 4634. It certainly is much better than hammering CTRL after a page load. This is very much appreciated!