EclaireXL

v15 is dead and the large structural changes are still a lot of work.
As such I've revised the v15 wip as v16 and ported it to v1 and v2 boards.
This is largely just to get the svn branch back in a state so it builds. So I can work on random little fixes independently of the large structural core changes(different cpu, debug support, linear ram etc)

A reminder:
DONE:SIO IN has zpu output on
DONE:US keyboard selection
- NO BLOCK RAM FOR ZPU LEFT!!
DONE:freeze when exiting zpu menu
DONE:debug port over gpio (v2 only)
DONE:rom in block ram (inc load from sd)
- found bad we
- removed clear
DONE:Antic refresh behaviour on pbi
DONE:svideo atari style (v2 only - also note that on v1 composite also does nothing right now, use svideo for composite and svideo)