Improved the BusLogic incoming mailbox code;
The BusLogic callback is now three-phases and outgoing mailbox interrupts are emulated correctly;
Fixed the CD-ROM command READ DISC INFORMATION (0x51), fixes NetBSD crashing 86Box with segmentation fault when using the AHA-154x;
Added the CD-ROM command PAUSE/RESUME ALT (0xC2).
Uncommented auto-setting FDC data rate to 250 kbps on non-AT machines; fixes floppies on IBM PC and XT and clones;
Removed flto flag from the makefiles, should speed up compile times and make the XT and earlier machines work again;
Removed CGA brown and color burst settings in line with mainline PCem.
