Revert "Modify work_queue to create "cache" and "uncache" subdirectories to handle cacheable and uncacheable files."

This caused us to break both forwards and backwards compatibility, and we figured out a better way to achieve the same goal

This reverts commit f90b39f1a088125b6c1ea41d3dbbb42b40752dfc.

Conflicts:
	work_queue/src/work_queue_worker.c
Alternative fix for name colisions between cached and uncached files.
Less protocol-breaking than f90b39f1a08.

This adds ".cached" to the end of each cached file when stored in the cache directory.
It effectively creates a separate namespace for files declared as cacheable that cannot
be impinged upon by uncached files, and vice-versa.