Extend StreamFormatting to seperate linewrap and indenting

[ChrisJefferson]

This is another attempt at an idea previous discussed in #4496 and #4511

This allows passing a record to SetPrintFormattingStatus with separate linewrap and indent options. PrintFormattingStatus now always returns a record.

This code needs obvious documentation (help welcome!) but I thought I'd see if it merges, and the direction seems basically sensible.

After this we may want to make further changes, for example disabling linewrap by default for things like OutputTextFile, but that can be a separate PR.

[fingolfin]

I think you need to run TestDirectory("tst/testinstall", rec(rewriteToFile:=true));

[fingolfin]

Seems generally sensible to me. Of course as you say, it stills needs to be documented, tests adjusted etc. But it makes sense to first gather feedback, e.g. from @frankluebeck and @ThomasBreuer

[ChrisJefferson]

I've rebased this PR, after a bunch of changes / reformattings. It still lacks documentation, which I'm happy to write, but would like to know if anyone is fundamentally opposed to the idea first.

[fingolfin]

I (still) like this. Of course docs are needed. Some minor comments.

One more ping to @frankluebeck and @ThomasBreuer in case they would like to comment

[ChrisJefferson]

I've cleaned up this PR so it applies to master, and added some basic documentation. I removed (most) of the whitespace-only changes, which should make the PR easier to read, hopefully.

This is quite a significant change to a fairly fundamental part of GAP (how indenting and line wrapping works), so there might be some fallout I haven't noticed.

[zickgraf]

I'm not sure if the following is the expected behaviour:

gap> PrintFormattingStatus(OutputTextString("",false));
true

I would expect the return value to be a record.

[fingolfin]

Started a package distro CI run against this PR, logs at https://github.com/gap-system/PackageDistro/actions/runs/7589478131

[james-d-mitchell]

Semigroups package tests fail but I'm happy to make a release and update things to accommodate this Pr

[ChrisJefferson]

Some of that output looks really strange, with very strange wrapping -- should probably try to figure out what's going on, as the only change I would expect from this would be if you actually tried to print out the value of PrintFormattingStatus, and saw it's now a record instead of a boolean.