update math package status to reflect unicode-math/luamml compatibility

[mbertucci47]

Following the discussion in #860, this updates the status for several math packages to reflect compatibility with unicode-math and luamml. This only covers some packages because I want to make sure this is what was in mind before finishing the rest.

Basically any package that is incompatible with unicode-math or has no luamml support (which is most, unless they use basic constructs) is listed as partially compatible with a note.

The phrase "Use of math tagging currently requires support from external tools" was removed from those entries; I'll remove the rest in another PR once this one is merged.

Where it made sense, I added \UseName{sys_if_engine_opentype:T}{\usepackage{unicode-math}} to test files so that #858 doesn't error on all pdftex tests.

For the changed test files, I also used tagging=on instead of testphase={...}. I'll do a mass conversion in another PR because otherwise the relevant diffs would be difficult to find.

[FrankMittelbach]

looks fine to me. @davidcarlisle ?

Concerning sys-if-engine_opentype:T Didn't we plan or even have a CamelCase name for that as well?

[mbertucci47]

@FrankMittelbach I'm not aware of any 2e name for \sys_if_engine_opentype:TF. iftex has \iftutex but this seemed easier than loading another package in every test file

[davidcarlisle]

@FrankMittelbach I'm not aware of any 2e name for \sys_if_engine_opentype:TF. iftex has \iftutex but this seemed easier than loading another package in every test file

yes I think it's fine here, and anyway being very regular we can always change if we do add a test in the format. I'd have probably used \ifx\Umathchar\undefined\else ... out of habit but technically this is probably better anyway (as it avoids loading the whole package within the scope of the ifx)

[FrankMittelbach]

@FrankMittelbach I'm not aware of any 2e name for \sys_if_engine_opentype:TF. iftex has \iftutex but this seemed easier than loading another package in every test file

absolutely, I was only thinking we had some discussions to include something (to avoid keeping @davidcarlisle in the habit :-) ) but perhaps I misremembered and it was only for the iftex package.