Gc decode improvements (#312)

* Add tools build files & binaries to .gitignore

* Allow dumping the raw code in gc_decode.
- Fix up dumpRawResult formatting and results.
- Clean up gc_decode output
- Add a -raw flag to gc_decode.
- Dump raw output if gc_decode can't find a standard decoder.

.gitignore

@@ -27,6 +27,12 @@ lib/googletest/**/*
 test/*.o
 test/*.a
 test/*_test
+
+# Tools builds
+tools/*.o
+tools/*.a
+tools/gc_decode
+
 .pioenvs
 .piolibdeps
 .clang_complete