Scott Lamb 678500bc88 stop using a couple unstable features
It would be nice to build on stable Rust. In particular, I'm hitting
compiler bugs in Rust nightly, such at this one:
https://github.com/rust-lang/rust/issues/38177
I imagine beta/stable compilers would be less problematic.

These two features were easy to get rid of:

* alloc was used to get a Box<[u8]> to uninitialized memory.
  Looks like that's possible with Vec.

* box_syntax wasn't actually used at all. (Maybe a leftover from something.)

The remaining features are:

* plugin, for clippy.
  https://github.com/rust-lang/rust/issues/29597
  I could easily gate it with a "nightly" cargo feature.

* proc_macro, for serde_derive.
  https://github.com/rust-lang/rust/issues/35900
  serde does support stable rust, although it's annoying.
  https://serde.rs/codegen-stable.html
  I might just wait a bit; this feature looks like it's getting close to
  stabilization.
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