wrsw_rtu: re-done Wishbone register layout to have indirect addressing of PCR registers. Replaced plain signal WB register connections with a structure

swcore[new mpm]: bugfix in the MPM: empty HIGH at the very last word caused the Rx Path to go nuts, fixed by ANDing d_last_int with counter_equals

swcore[new mpm]: corrected the way the first page is cleared and how we make sure that it is cleared at the end of the first page receptipn

swcore[new mpm]: more debugging and corrections of input block, changing simulatioon to test 16 ports