Backport libgap api to 4.10

[fingolfin]

This is a backport of all the libgap-api changes done on master, so that these will appear in GAP 4.10.1. I hope this will help folks like @embray who are trying to use this.

Of course we can delay merging this in case people plan to submit more libgap-api changes. Or we just make additional PRs for that.

Note that I had to make some minor modifications to libgap-api.c: We don't have RequireInt in stable-4.10, nor NewPlistFromArray. For the latter, I just added it to libgap-api.c; for the former, I replaced the call by (almost) equivalent code using ErrorMayQuit. For future updates, one needs to retain those (but that's easy enough).

Note: I did not cherry-pick individual PRs modifying libgap-api, as that would have been more work with no clear gain. Nor did I cherry-pick the commit which added NewPlistFromArray, as it also modified several .c files, and while those changes should be harmless, I'd rather go for minimal changes that are guaranteed to not affect code outside libgap-api.c.

[codecov]

Codecov Report

Merging #3065 into stable-4.10 will decrease coverage by 0.03%.
The diff coverage is 17.85%.

@@               Coverage Diff               @@
##           stable-4.10    #3065      +/-   ##
===============================================
- Coverage        76.03%      76%   -0.04%     
===============================================
  Files              482      482              
  Lines           241693   241810     +117     
===============================================
+ Hits            183782   183784       +2     
- Misses           57911    58026     +115

Impacted Files	Coverage Δ
src/integer.h	100% <ø> (ø)	⬆️
src/libgap-api.c	12.87% <8.06%> (-80.46%)	⬇️
src/integer.c	92.41% <93.75%> (+0.08%)	⬆️
hpcgap/lib/hpc/stdtasks.g	64.19% <0%> (-0.52%)	⬇️

[dimpase]

looks good to me.

[dimpase]

all good, IMHO

[embray]

Thanks--I have a couple other patches I've been meaning to propose but we can handle those in a followup.