Merge branch 'master' into library-use-case

# Conflicts:
#	Cargo.toml
#	src/machine/mock_wam.rs
#	src/machine/mod.rs

src/bin/scryer-prolog.rs

@@ -3,10 +3,18 @@ fn main() -> std::process::ExitCode {
     use scryer_prolog::*;
     use scryer_prolog::atom_table::Atom;
 
+    #[cfg(feature = "repl")]
     ctrlc::set_handler(move || {
         scryer_prolog::machine::INTERRUPT.store(true, Ordering::Relaxed);
     }).unwrap();
 
+    #[cfg(target_os = "wasi")]
+    let runtime = tokio::runtime::Builder::new_current_thread()
+        .enable_all()
+        .build()
+        .unwrap();
+
+    #[cfg(not(target_os = "wasi"))]
     let runtime = tokio::runtime::Builder::new_multi_thread()
         .enable_all()
         .build()