Rock manifest file format

The rock_manifest file lists the files contained in a binary rock, with the MD5 checksum for each file.

It is a Lua file containing a single global variable definition, that defines the variable rock_manifest, assigning to it a table of file checksums of the [archive file's root directory](Rock file format) (except for the rock_manifest file itself).

A ''table of file checksums'' is defined as a table describing a directory, where for each entry in the directory, there is a string key with its filename (only the basename).

If the filename is a non-directory, the value of its key is a string with the MD5 checksum of the file.

If the filename is a directory, the value of its key is itself a table of file checksums of that directory.