Toggle settings for magnifier focus (#19739)
Closes #19712
Summary of the issue:
NVDA's magnifier lacked per-source tracking toggles: mouse, system focus, review cursor and navigator object could not be independently enabled or disabled.
Description of user facing changes:
Four new checkboxes in the magnifier settings panel let users independently enable or disable tracking and four new gestures to toggle these settings (no key bidding yet).:
mouse pointer
system focus
review cursor
and navigator object.
Description of developer facing changes:
FocusType enum gains a REVIEW
FocusManager.getCurrentFocusCoordinates() now gates each source based on config.
Description of development approach:
The priority chains has been updated
