parser: remove lots of stmt stuff

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
parser: update for statement changes

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
parser: remove null statement

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
parser: update for statement changes

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>