Attempt to fix Last Bronx booting, still uses a shitload of unsupported opcodes, fun ...
Small core cleanup (nw)
no need for including assert.h since overload is in emucore.h that we already include with emu.h(nw)
reverting r28187, if menus are unusable at that size user should make window bigger (nw)
Fixed crash introduced in r29533 when the 6551 transmitter and receiver is shutdown (nw)
MESS: clcd.c default the centronics port to empty, the built in apps can't print to centronics anyway (nw)
(mess) ser_mouse: make msft mouse work again (nw)
isa8_device and isa16_device: converted to devcb2 (nw)
bitbanger_device: converted to devcb2 (nw)
Loading coco doesn't crash, but someone familiar with the system should test it. Thanks!
z88cart_slot_device: converted to devcb2 (nw)
(mess) at: simplify, simplify (nw)
iq151cart_slot_device: converted to devcb2 (nw)
x68k_expansion_slot_device: converted to devcb2 (nw)
Merge git://git.redump.net/mame

Conflicts:
	src/mess/drivers/coco12.c
	src/mess/drivers/coco3.c
	src/mess/machine/coco.c