Changes

scan-doubler (simple TV to VGA converter) doesn't run ok in mode 2, but there is some many recent demo effect that doesn't pass using current VGA 72Hz implementation. Have to try to insert both VGA implementations(=> done in r005.8.15.2)

core_r005c18 seems having a scan-doubler outputOn Sorgelig fork, have to merge it.the scandoubler does pass in mode 2 (but still not centered correctly on VGA 16/9)