Added built-in node-inspector external module for remote debugging.

Signed-off-by: marco.minetti <marco.minetti@novetica.org>
Updated external devtools readme.md files.

Signed-off-by: marco.minetti <marco.minetti@novetica.org>
Removed obsolete and version strict dependencies.

Signed-off-by: marco.minetti <marco.minetti@novetica.org>
Added package.json files to external devtools modules.

Signed-off-by: marco.minetti <marco.minetti@novetica.org>