Setting VBE memory size to 4, 8, 16 and 32 MB is now possible. Since a memory
size change can also change the number of available modes and the value for
"number of image pages" in the mode info it is required to use the latest
VGABIOS binary.
Related changes:
- Make sure the VBE entry appears at index 1 of VGA extension option list.
- Removed all memory size constants and use BX_VGA_THIS s.memsize instead.
TODO: Remove the static mode info table and create it dynamicly similar to
Banshee and Cirrus.
c511f3f270