Ensure that newer versions don't refer to files older than the latest for a particular file type

[extremeheat]

There should be a test to ensure that newer versions don't refer to files older than the latest for a particular file type

Catch problems like #1084 (please check https://patch-diff.githubusercontent.com/raw/PrismarineJS/minecraft-data/pull/1084.patch)

For example,

"pc": {
   "1.5": { "test": "pc/1.5" },
   "1.6": { "test": "pc/1.4" } 
}

should be blocked because a previous pc test used pc/1.5, but 1.6 is for some reason referring to even older data (it should instead be either pc/1.5 or pc/1.6).

Suggested implementation:

• Make integer out of each path, store in cached map
• When iterating over new entry, check each data item's current integer is >= last integer
• Since some versions may reference non-versions (pc/latest), simply skip these entries