Add a command line option to enable auto grab.
Default to the previous behavior before the auto grab feature was added.
Add a debugger command to enable or disable auto grab.
Notes:
Auto grab mouse currently only works for graphics controllers and guest
OSs that use a hardware cursor and only if the emulation sets
cursor_dirty to true (i.e. not emulation that uses cursor_ovl_cb).
joevt
db5ab5f63c