Fix windows tests

[talregev]

My commits above yours give better results:

1. Add fix for compilation in Visual Studio. This seems to be a weird issue with how size_t is interpreted since the multiple symbols defined error comes from additional declarations of std::map<Key, size_t>. This might be a bug in MSVC 16.
2. Fixed some more tests across the repo.
3. Updated the Windows CI to run additional GTSAM tests as well as some gtsam_unstable tests.
4. Compile with ninja
5. GTSAM_EXPORT on functions.
6. GTSAM_EXPORT on nested structs / classes.

[talregev]

@varunagrawal If you can approve the ci it will be great.
You can also look on the CI on my repo:
talregev#8

[talregev]

[varunagrawal]

Why not checkout my fix branch, make a branch off that and then target this PR to my branch? That will make the history clean and avoid duplication.

[talregev]

Why not checkout my fix branch, make a branch off that and then target this PR to my branch? That will make the history clean and avoid duplication.

Because it has conflict with develop when I do that. I solve also the conflict.

[varunagrawal]

Why not checkout my fix branch, make a branch off that and then target this PR to my branch? That will make the history clean and avoid duplication.

Because it has conflict with develop when I do that. I solve also the conflict.

Go ahead and do that. I'll resolve the conflict with develop on my branch when we merge this to #1553.

[talregev]

I guess I have more problems.

[varunagrawal]

Okay wait I am resolving this here.

[varunagrawal]

@talregev you should now be able to push to this PR without problems.

[talregev]

@varunagrawal
Thank you for your merge, I hope it will not effect the solution.

I want to add:

concurrency:
  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
  cancel-in-progress: true

To all workflows.
This code mean that every time I push a commit to my PR, the other check will cancel immediately and the runner (vm machine) will available for the next push. (This include any other person that open a PR). There is a limit for 20 machine per repo.
This make more rapid checks for the PRs.

[varunagrawal]

I love that idea! Also add a comment in the workflow file explaining that how you did over here. It is very useful!

[talregev]

@varunagrawal Please approve again my CI :)

[talregev]

It will affect on my next push.

[talregev]

@varunagrawal Can you cancel the actions on previous commit? It will take forever until it start running on the new commit.
Because I added the new code, only on the new commits, the runner will cancel automatic.

[talregev]

The selected ones:

[talregev]

@varunagrawal I am done working on this branch.
There is one or more multiply defined symbols found errors that I don't know to solve for now.
Can you merge this branch to your windows fix and start play there?
Once you solve these errors, I will continue to open the rest of the tests and solve the other issue of linkages.
I will create a new branch and a new PR from your fix/windows-tests branch after the merge.

Thank you for your help.