Revert "Support old names for the fs and chrono drivers."

This reverts commit 53e760f46ef5939b87db864c0c5e6818fef067fb.

Late commits with brains turned off are no good. This patch actually
crashed everything instead of working or doing anything useful, because
essentials always start first, the old names were registered and then
the actual Filesystem or Chrono plugin crashed everything because of the
name clash.