Move changes from exp2 to main

This is largely a move to simplify a lot of the readers
Also further breaks out functions.

internal/decompress/lzo.go

@@ -0,0 +1,18 @@
+package decompress
+
+import (
+	"bytes"
+	"io"
+
+	"github.com/rasky/go-lzo"
+)
+
+type Lzo struct{}
+
+func (l Lzo) Reader(r io.Reader) (io.ReadCloser, error) {
+	cache, err := lzo.Decompress1X(r, 0, 0)
+	if err != nil {
+		return nil, err
+	}
+	return io.NopCloser(bytes.NewReader(cache)), nil
+}