Add Raith MBMS Paths

[MatthewMckee4]

from #252. I have implemented mbms path functionality into the FlexPath Object (raith_data and base_cell_name), and added support for reading and writing to and from gds. I have also added more appropriate type hints to the gdstk.pyi file.
These changes should not affect any pre-existing functionality.

[heitzmann]

Thanks @MatthewMckee4 ! That's quite the effort. I'll try to go over your changes this weekend!

[heitzmann]

This is a great implementation, thanks @MatthewMckee4 for sticking to the source standards! I've added a few comments throughout the PR, if you could take a look.

Also, I'm assuming you've tested this implementation with the Raith software, right? I have no way of testing this myself except for bare minimum correctness.

[MatthewMckee4]

Thank you, this is my first time working with c++ tbh so I'm glad to hear it's not horrible. I will get these changes updated asap.

[MatthewMckee4]

@heitzmann is there any chance of this getting merged soon? I'm currently under some pressure at work to get this done so if you have a timeline that would be greatly appreciated.

[heitzmann]

I saw a few pushes so I was not sure you were finished with the changes. If you are, we can merge it already!

[MatthewMckee4]

Yeah, I'm all done with my changes now. Thanks.

[heitzmann]

Tests are failing with a segfault. Have you tested locally, @MatthewMckee4 ?

[MatthewMckee4]

I was having some issues so I didn't manage to test much, my apologies. I will get these issues fixed asap

[MatthewMckee4]

@heitzmann I am unable to reproduce the issues on my device but from the logs, I can see some issues:

I have fixed the issue on line 160, this was simply me writing the wrong method. The other issue though comes from:

where dwelltime_selection is:

would I be right in changing this to:

or

If not whats the correct casting function?

[heitzmann]

@MatthewMckee4 I went over all the changes and made a few modifications I thought necessary. Could you please test commit 2c963ba to make sure it works? I don't have a way to test the Raith data locally. If all's working, we can create a new release with the new feature. And thanks again for the push!

[MatthewMckee4]

@heitzmann this passes all of our tests. Should be good to merge!