Added WIDX_PICKUP.
Added window_staff_peep_close and window_staff_peep_mouse_up.
Added window_staff_set_page.
Added window_staff_peep_page_events for all tabs.
Moved window_create into window_open and renamed sub_6BED21 to window_staff_peep_disable_widgets to follow the same pattern as window_peep.
Added missing addresses.
Added rename code for guests and staff.
Added code for Pickup for guests and staff.
Merge pull request #352 from hexdec/window_staff_peep_functions

Window staff peep functions
Merge branch 'master' of https://github.com/IntelOrca/OpenRCT2