Merge of r004.8.2 with r005c18.
r004.8.3 is unvalidated (regression on Tetris95 : problem giving your name for score)
scandoubler is unvalidated for CoreAmstrad (no mode 2)
r005 is r004.8.2 with TV mode (in OSD menu, at bottom), and VGA mode (no scandoubler)
ps2 clock built instead of generated (shall be more safer)