LaunchELF commit, 2018/10/20

Changelog:
Consolidated hardcoded values as enumerations or definitions.
Updated USBHDFSD, for compatibility with devices that have a single Alternate Interface configuration.
Fixed loading & saving of configuration to the HDD unit, when LaunchELF is booted from the HDD unit.
Settings like the video mode should now be binding, when LaunchELF is loaded from the HDD unit, since the GS is now initialized after the configuration file is loaded from the HDD unit.
Removed support for being booted from the "pfs" device because it cannot happen and cannot be processed (unable to determine the partition it was booted from).
Added more comments to explain the code that loads files from the HDD unit.
Removed code for "triggering poweroff" that did not do anything.
Fix for poweroff when there is no SPEED (no network adaptor) connected: check that DEV9.IRX successfully loaded and returned RESIDENT END.

Downloads/Links
LaunchELF: https://www.sendspace.com/file/d3ugcf

Changelog:
Updated USBHDFSD to fix the bug causing files to be unable to be replaced properly