fixed getRegisteredInputs incomplete results in m2e

Signed-off-by: Igor Fedorenko <igor@ifedorenko.com>
fixed wrong input status inside m2e workspace

Signed-off-by: Igor Fedorenko <igor@ifedorenko.com>
clarified BuildContext#registerInput use in m2e workspace

Signed-off-by: Igor Fedorenko <igor@ifedorenko.com>