Assorted fixes and improvements

[lemondrops]

Summary

• Removes build options from the root CMakeLists.txt that were removed from the code and no longer do anything
• Makes MSR 17h (available from Pentium II Deschutes onward) read-only and return a suitable Platform ID depending on the CPU package. Fixes some system information utilities misidentifying Mendocino Celerons as Slot 1 instead of Socket 370
• Implements Machine Check Exceptions and Machine Check Architecture MSRs and CPUID flags on CPUs that support (or pretend to support) it
• Limits the maximum bus clock of the VPC2007 machine to 66 MHz, due to BIOS unable to handle a higher clock
• Renames the Soyo 4SA2 motherboard to 4SAW2, adds VLB and PS/2 mouse support to it
• Adds a config migration path for the PS/1 model 2121 variations that were merged in 3.0
• Adds config migration for the renamed joystick types and adjusts the backwards compatibility with legacy integer-based configs accordingly
• Fixes the maximum PIO mode reported by emulated IDE hard drives as 1 instead of 4 when using a bus-mastering IDE controller
• Fixes IBM PC and XT incorrectly identifying a floppy drive being present when no floppy drives are enabled in 86Box settings
• Adds the necessary PCI register handling to properly present the ViRGE/GX2 and Trio3D/2X as supporting AGP. Also makes the GX and GX2 to report having SGRAM instead of EDO DRAM in the CRTC register 0x36.
• Allows use of ATAPI devices with XT-IDE
• Makes the internal real-time clock synchronize with host time every time the emulator is unpaused, instead of merely on init
• Makes the standalone MPU-401 selection unavailable on machines without the ISA or MCA bus
• Makes the selection of ISA RTCs, memory expansions, and ISABugger unavailable on machines without the ISA bus
• Fixes indentation in snd_sb_dsp.c, expands SB16 0851 RAM emulation and adds ASP/CSP chip internal RAM emulation, based on code from DOSBox-X

Checklist

• I have discussed this with core contributors already
• This pull request requires changes to the ROM set
  • I have opened a roms pull request - 86Box/roms#147

References

IA-32 Intel Architecture Software Developer's Manual -- information on Pentium/Pentium II MSRs
http://oldcomputers-ddns.org/public/pub/rechner/siemens/scenic300/microcodepatch/p6_patchliste.pdf - contains a list of P2-era platform IDs
Soyo's archived website -- 4SA2 BIOS used with 86Box being identified as "4SAW"
ftp://technotron.asuscomm.com:2021/Backup/WD/30/Report.htm -- contains a PCI register dump of an S3 Trio3D/2X (near the very end of the report)