Support for disabled runtime marshalling

[alexrp]

https://learn.microsoft.com/en-us/dotnet/standard/native-interop/disabled-marshalling

There was some discussion on this topic in #428; I figured I'd open this issue to track support for this feature.

The bool issue in particular is one that I'm running into with a library that I'm generating bindings for. I am using [assembly: DisableRuntimeMarshalling] so it's a bit unfortunate that the P/Invoke signatures end up using byte. (Perhaps also worth noting that remapping with --remap _Bool=bool and/or --remap bool=bool as a hacky workaround isn't possible.)

[kkukshtel]

I ended up just doing a cast for the "bool" type at the calling location/handoff to managed code. I only ever touch the values once so it worked well enough for me.

[tannergooding]

Resolved in #480