Many changes and some fixes

All the changes are listed in the Changelog.md. The following is some of the more important ones:
- Use edk2 for path conversion (supports all known node types).
- Added the ability to convert a single efi device path from bin, hex, or nvram format to string or from string to bin. The input can be an argument or stdin. stdin is required for binary path.
- Fixed the format of ioregistry output so that the ioregistry path is complete and can be used to convert an ioregistry device to an efi path.
- efi path node sizes are now verified.

Changelog.md

@@ -1,5 +1,38 @@
 gfxutil changelog
 =================
+#### 1.79b joevt Dec 24, 2019
+- Replaced efidevp.h, efidevp.c according to the following changes:
+- Added edk2 for efi stuff. It is used for all device path conversions to and from text.
+  Therefore all node types can be converted, not just PCI and ACPI.
+- Added edk2misc.c and edk2misc.c for compatibility with edk2.
+- There is now only one function for iterating over the ioregistry.
+  It outputs all devices (-p or -t) or devices with a certain name (-f).
+- Added flags for device path conversions:
+  -l Display Only (display only paths cannot be reversed back to binary).
+  -m Don't Allow Shortcuts (shortcuts make vendor nodes more readable).
+- For string conversion, assume strings don't have trailing null. This seems to work for
+  MacPro3,1 and Macmini8,1 device properties.
+- Fix searching for end of device path bytes so that the search does not exceed the
+  end of the device properties. Also, the search now skips data inside a node.
+- The call to isHexString was not checking the last character of the string (for
+  converting hex string paths to bytes).
+- Device paths can now be UTF16 in the plist. Property names still need to be ASCII.
+- Paths work for both ACPI and PCI devices.
+- Results of -p, -t and -f return PCI bus:device.function numbers, PCI vendor and device
+  ID, and full ioregistry path (Device plane) with the EFI device path.
+- ioregistry is searched in the same order shown by ioreg or IORegistryExplorer.app (with
+  -t or -f).
+- Require -p or -t to output all devices.
+- Added the ability to convert a single efi device path from bin, hex, or nvram format to
+  string or from string to bin.
+- The command by itself will convert the path from stdin (stdin is required for bin).
+- Help text uses spaces instead of tabs.
+- Return 1 for error. 0 for no error.
+- Fixed indent of verbose output to work more like ioreg output but also trims trailing
+  spaces.
+- Added code to verify the lengths of each node in a binary efi path.
+- Added the ability to override or wrap the conversion routines of edk2.
+
 #### 1.79b
 - Fix unsupported registry entry class type error
 - Run without command line args to get devicepaths for all PCI devices