Make swap_move() only be defined for INDIRECT_SWAP where it only moves the table...

Make swap_move() only be defined for INDIRECT_SWAP where it only moves the table memory, replace core_to_swap_copy() and swap_to_core_copy() with swap_read_write() which works in blocks and takes a direction flag, implement do_swap_read_write() to abstract out the swapping code which is independent of the direction