Move patch-graphics-from-master.pl into maint-bin

This means all our maint utils are in one place.

This commit also updates the code to work in a more location
independent fashion.
Updated Masterwork Dwarf Fortress.exe from Splinterz

The executable is 9a26638200cd7dc6a5f3ed1b854b5cd50c496be5
Merge branch 'master' into unified

* master:
  Updated Masterwork Dwarf Fortress.exe from Splinterz
  Move patch-graphics-from-master.pl into maint-bin