Tools: Create a script to extract files from GRF archives

No bulk extraction since it isn't needed at this time.

Tools/extract-from-grf.lua

@@ -0,0 +1,14 @@
+local RagnarokGRF = require("Core.FileFormats.RagnarokGRF")
+
+local fileToExtract = arg[1] or error ("Arguments: fileToExtract [destinationFolder optionalArchiveName]")
+local grfPath = arg[3] or "data.grf"
+local destinationFolder = arg[2] or grfPath .. ".extracted"
+local destinationPath = path.join(destinationFolder, fileToExtract)
+
+C_FileSystem.MakeDirectoryTree(path.dirname(destinationPath))
+printf("Saving %s to %s", fileToExtract, destinationPath)
+
+local grf = RagnarokGRF()
+grf:Open(grfPath)
+grf:ExtractFileToDisk(fileToExtract, destinationPath)
+grf:Close()