Constructors taking `Into<String>`

[icefoxen]

Description

Adds various new() funcs taking Into<String>

This is basically just boilerplate, as discussed in #15. This is in its own PR so you can decide separately whether or not you want it. It's not really finished, just intended as a sample for discussion.

Changes proposed in this pull request

• Add new() functions for most/all types so that we can take Into<String> for names instead of just Strings.

ToDo

Still need to do for this:

• [ ] Add functions for Instr struct
• [ ] Proposed feature/fix is sufficiently tested
• [ ] Proposed feature/fix is sufficiently documented
• [ ] The "Unreleased" section in the changelog has been updated, if applicable

[garritfra]

From your ToDo-list I read that you're still working on this PR. I'll convert this to a draft, for clarity. Hope you don't mind! 🙂