* Create command event handler for orienting schematic items and block.
* Remove redundant orient item and block command handler code and IDs.
* Remove redundant cancel current command event table entry.
* Remove unnecessary schematic bitmap object virtual functions.
* Set path when saving schematic sheet files to prevent assertion in
  updated path and file write permission test function.
* Restore directory and file name write permission test function to it's
  previous behavior to prevent unexpected save results.
* Add an assertion to verify the path is not empty to directory and file
  write permission test function.
* Improve documentation for path and file write permission test function.
* Fix Doxygen link warnings.