RTUex: adding configuration bit to enable/disable learning of unrecognized destination MACs (disabled by default)

Conflicts:
	ip_cores/wr-cores
	top/bare_top/scb_top_bare.vhd

Conflicts:

	modules/wrsw_swcore/swc_alloc_resource_manager.vhd
	top/bare_top/scb_top_bare.vhd

greg_counters: use constant from endpoint package insidating how many events are generated by the endpoint

TRU: adding quick block BPDU handling (blocks a port on reception of special frame) and cleaning a bit with hardare generation/reception of frames

RTU: addressing the problem of forwarding urecognized broadcast traffic and other broadcast traffic (including HP) to CPU (Network InterFace, NIC) - this can cause the CPU to get stuck when the traffic is huge. This problem should be separately addressed in NIC. But RTU was extended with disabling (by default) HP and unrecognized broadcast traffic from being forwarded to CPU (it seems not useful there), however the behavior can be chaned with configuration

SWcore: bugfix rx frame error reception (the error status was not written to MPM, so the output Endpoint did not know it's sending broken frame, it added CRC, and the frame became theoretically-OK)

SWcore: small corrections to make the new stuff working: HP-traffic recognision received by SWcore from RTU, output dropping at HP config

SWcore: added droping of a nonHP frame which is being transmitted if a HP frame is being queued (optional - configured from TATSU)

SWcore->MPM: implemented abort in the read path of the MultiPort Memory (a bit hack-ish: abort by reset). Also cleaned commented and unnecessary stuff (I know I should do it in separate commit...anyway, it is easy to distinguish)

SWcore: updated transfer artiber (+interfacing input/output blocks): added transfer of hp bit (high prio traffic), removed info about pck_size/resources (not used)

SWcore/TRU: corrected PAUSE concellation (write zero-quanta request) and problems with port_mask vector len

TATSU: modified TATSU I/F appropriatly to work with the generalized global-PAUSE I/F of SWcore (previous commit)

SWcore: generalized global PAUSE implementation and mechanism: now generic number of global-PAUSE can be defined and provided to SWcore

TRU: modified mechanism makes requests to SWcore to block output queues, modified interface to SWcore