Slight reworking in the mouse and network code (ported from VARCem) in preparation for a major change that will const a lot of things to further reduce RAM usage.
Replaced the Cirrus Logic code with the latest code from TheCollector1995 - the CL-GD 5428 is now fully working, as is the CL-GD 5429;
Minor clean-up in the AHA/BusLogic BIOS commands code;
Slightly rewritten mem_readb_phys_dma() and mem_writeb_phys_dma().
Fixed AHA-154x scatter/gather transfers;
Two-phased SCSI read-direction commands;
Made scsi_bus.c use a dynamically malloc'd buffer instead of a giant fixed-size buffer;
The AHA-154x/BusLogic thread now uses mutexes;
The BusLogic BT-545C is now the BT-545S;
Added the BusLogic BT-542BH;
The AHA-1542CF now again uses the v2.11 BIOS as the CD booting now works;
Applied PCem commit that adds NMI support to the recompiler;
Applied PCem commit that adds the IBM XT 286;
Applied PCem commits that have to do with sound, including the ES1371;
Fixed the NCR5380 output data register;
Moved the SLiRP mutex stuff from win.c to the appropriate network files;
Added sanity checks to everything in win_thread.c.
