Added a parameter that specifies where a file has to be from to be valid

for sorting. E.G: If this file isn't from this directory, I don't want
it in this output directory.

DirConfig.toml

@@ -1,10 +1,11 @@
 Title = "Unset"
 LastFile = "Unset"
 ParentDir = "Unset"
+ValidInputDirs = ["*"]
 
 [[Files]]
 Pattern = "*"
 NewFileName = "~^"
 NextNum = 1
 NextChar = "A"
-CaseSensitive = 0
+CaseSensitive = 0