Rust Features and Target

[TylerBloom]

Currently, the rust-analyzer setup in the nvim config uses all features and defaults to the system's target. These are reasonable defaults and work 85% of the time. However, there are times when you need to compile for another target (namely WASM) and/or need to adjust the active set of features.

I'm unsure if there are plugins for this. If there are not, it would be a good introduction to writing a vim plugin.