Move more items into generic_cdrom.xml

[chungy]

Two discs that were duplicated between Mac and PC lists (Chex Quest and My First Math Adventure) were moved to generic_cdrom. The id Anthology was moved to generic_cdrom, uniting the set to represent the physical release better.

All multi-architecture Windows NT 3.1, 3.5, and 4.0 discs were moved to generic_cdrom. Compatibility tags have been added to all entries. New "IBM5170" and "MIPS_MAGNUM" tags were defined in the pc/*.cpp and microsoft/jazz.cpp drivers. "ALPHA" and "PREP" tags are in the generic_cdrom.xml file, but have not been attached to any drivers.

[angelosa]

The idea was to be slower in adding stuff to generic_cdrom (like few entries at a time), not rush things asap.
Also I don't like the tags used, like I don't want IBM5170 and don't want Mac CPU style tagging in there (it's confusing as it gets). And preferably they should be lowercase (like the other generic file is).

[chungy]

Could we meet half-way and at least move the Windows NT images? they're rather large, so I don't want to have duplicate items in different lists. I find it useful to have them available for the mmr4000le driver (in src/mame/microsoft/jazz.cpp), without having to type out file paths to the ibm5170_cdrom set.

The compatibility tags could be adjusted of course. Not all NT4 images support MIPS; and not all of them support Alpha either, so filtering them out seemed to be a good idea depending on driver support.

[angelosa]

Are those really jazz rather than MIPS_MAGNUM?
As for ibm5170, just call it ibmpc.

[chungy]

I think it should probably be MIPS_R4000. Magnum (and Jazz) are specific machines with the supported CPUs. There are at least a couple other MIPS computers that supported Windows NT and MAME could hypothetically support them in the future. It should be best to state the generic CPU instead of a model of computer.

Not sure when I'll have time to prepare an NT-only PR, pretty busy today :) If not today, then tomorrow.

[chungy]

I will close this pull request, a replacement has been made at PR #14724. The Macintosh software could be done at a latter date, but there isn't a whole lot to deal with. :)