(Support) Added some filesystem utilities
Merge branch 'snippets' of ../snippets into m68k
(Binary Analysis) Partitioner improvements

* Added a convient place to attach GDB for debugging the partitioner
  and controlling it with "--trigger=debugger:bblock=<addr>"

* Fixed "--trigger=hexdump". It was printing the wrong data and
  not stopping at the right place.

* Added more info printed by "--list-instruction-addresses": addresses
  of the owning basic block and function when present.
(Support) Added a couple new methods to Sawyer::Optional

* isEqual() is an easy way to compare two optional values

* IntervalMap::exists takes const this pointer