Revert to old version of working SLAVE
Start
Added r
Keep hbusreq high until IRQ has been issued; adopted TB to new behav
added APB-Bridge and IRQ-Controller
Implemented necessary workaround for DMA_CTL-IRQ, adapted leon3 and TB

IRQ is now provided using APB interrupt bus, as AHBMO interrupts are obviously not being treated properly
(or require undocumented behaviour of master)
small change to support enable/disable IRQ
Revert "Revert to old version of working SLAVE"

This reverts commit 926fd8828e764e38d2a5055cd4baf26c2340fa00.
Merge with IRQ branch