Yuka Autopatcher

New tasks:

• auto Tries to automatically determine the processing method for the given arguments. is used if the first non-flag argument is not a registered command.
• patch <target.ykc> <patch.ykc> copies all files from one archive to another.

The patch task can do more than just that:
yuka patch --init <fetch-url> [<game-dir> [<patch-dir>]] will initialize a new patch directory and a .ypl (yuka patch log) file.
Opening the patch file with yukatool or passing it as the first argument to yuka patch will automatically download a list of patch files from the specified fetch url (in non-empty) and proceed to apply all patches in the patch directory (patches won't be installed if already applied).