SystemC Accessors: update in line with changes in mor1kx cpu wrapper

Remove the decode stage advance signal and instruction accessors - they're no longer needed
mor1kx mohor debug tasks: add stall check and read memory functions
mor1kx debug software breakpoint test updates

Add CPU pipeline detection stage, if we're a pipeline with delay slot then for every breakpoint we hit, see if the instruction beforehand was a jump, and if so, rewind to that jump instruction before unstalling
espresso testbench: updates
pronto espresso testbench: updates
espresso sw tests: add software breakpoint test stimulus code
espresso: update test lists in simulation makefile