Fixed#6671, vendor & buyer location never been updated if the location is changed
Added MF_NOBUYINGSTORE and CELL_NOBUYINGSTORE to separate from MF_VENDING & CELL_NOVENDING
Added some missing check for buyingstore states
Updated mapflag doc
Added new constants
Co-authored-by: Aleos <aleos89@users.noreply.github.com>
Co-authored-by: Lemongrass3110 <lemongrass@kstp.at>