Refactor rules folders into single file where appropriate to simplify down file management

[tredfern]

It's been interesting and nice having lots of small files, but in the end it's probably more work than
it's worth. Also, I don't know that it's helping with readability because it results in many more requires
to get the appropriate modules talking within itself.

Switch the folders to a single file, except for those cases where additional segmentation makes sense.

For example, Items might stay as a folder to allow it to contain more file for each item type, but player
could just simplify to a single file to hold all the necessary operations.

I will almost certainly redo this refactor in the other direction in a couple of months. But I will know more
by then.