Remove 'Automatically set system focus to focusable elements' (#17598)
Closes #16469
Closes #15463
Closes #15780
Summary of the issue:
The behaviour of "Automatically set system focus to focusable elements" is not reliable or well supported.
It is known to cause many bugs and unexpected behaviour in browse mode.
If it is to be reimplemented, clear user stories, well defined behaviour and a better implementation is required.
Description of user facing changes
The setting "Automatically set system focus to focusable elements" is removed from the settings panel and user guide.
The keyboard command to toggle it has been removed, freeing up nvda+8
The behaviour for NVDA now assumes the setting is off (the default).
Description of development approach
Replaced config.conf["virtualBuffers"]["autoFocusFocusableElements"] with False and then simplified the logic.
removed related code to the setting