Changes

VRAM contains 800x300 amstrad pixels (VZoom x2), displayed 640x480VGA 800x600@72Hz with fix regular border at 768×576 and fix inside border at 768×544.

* simple_GateArrayInterrupt.vhd (GA to VRAM) parameters : VRAM_Hoffset/VRAM_Voffset* aZRaEL_vram2vgaAmstradMiaow.vhd (VRAM to VGA) parameters : H_BEGIN/H_END/V_BEGIN/V_END (theorical fixed values)To calibrate : VRAM_Hoffset++ does offset one char left. VRAM_Voffset++ does offset one line up. On display H_BEGIN does begin to scan lines of VRAM. But V_BEGIN does not enter in consideration here : vertical=0 does begin to scan columns of VRAM. In original CPC, top border has 1/2 char more than bottom border. I used Batman Forever default welcome/calibration screen to calibrate VRAM offsets. RAM_palette contains the ink list and the mode for each line of VRAM, sampled at horizontal middle of 800x600 screen, and used at begin of each line.