split into lib and bin

* makes most pub things in src/ pub(crate) as not to expose things accidentally
  * only those things needed by src/bin/scryer-prolog.rs and tests/scryer.rs
    should be pub
* split src/main.rs into src/lib.rs and src/bin/scryer-prolog.rs
* add tests folder and run most of the files in src/tests with cargo test
  added bytes method to Stream in src/machine/streams.rs to check if stdout is as expected

src/machine/heap.rs

@@ -429,7 +429,7 @@ impl<T: RawBlockTraits> HeapTemplate<T> {
     }
 
     #[inline]
-    pub fn index_addr<'a>(&'a self, addr: &Addr) -> RefOrOwned<'a, HeapCellValue> {
+    pub(crate) fn index_addr<'a>(&'a self, addr: &Addr) -> RefOrOwned<'a, HeapCellValue> {
         match addr {
             &Addr::Con(h) | &Addr::Str(h) | &Addr::Stream(h) | &Addr::TcpListener(h) => {
                 RefOrOwned::Borrowed(&self[h])