Implement initial next implementation

This current implementation does not cover the following:

* Setting correct breakpoint when exiting loop
* Setting correct breakpoint when returning from function
    * All facilities are available for this, it just is not taken into
      account in the current `next` implementation.

dwarf/util/util_test.go

@@ -0,0 +1,37 @@
+package util
+
+import (
+	"bytes"
+	"testing"
+)
+
+func TestDecodeULEB128(t *testing.T) {
+	var leb128 = bytes.NewBuffer([]byte{0xE5, 0x8E, 0x26})
+
+	n, c := DecodeULEB128(leb128)
+	if n != 624485 {
+		t.Fatal("Number was not decoded properly, got: ", n, c)
+	}
+
+	if c != 3 {
+		t.Fatal("Count not returned correctly")
+	}
+}
+
+func TestDecodeSLEB128(t *testing.T) {
+	sleb128 := bytes.NewBuffer([]byte{0x9b, 0xf1, 0x59})
+
+	n, c := DecodeSLEB128(sleb128)
+	if n != -624485 {
+		t.Fatal("Number was not decoded properly, got: ", n, c)
+	}
+}
+
+func TestParseString(t *testing.T) {
+	bstr := bytes.NewBuffer([]byte{'h', 'i', 0x0, 0xFF, 0xCC})
+	str, _ := ParseString(bstr)
+
+	if str != "hi" {
+		t.Fatal("String was not parsed correctly")
+	}
+}