rr_graph: Reworking switches slightly.
rr_graph: Reworking switches slightly.

 * Adding switch type.
 * Trying to get shorts working.

Signed-off-by: Tim 'mithro' Ansell <b1c1d8736f20db3fb6c1c66bb1455ed43909f0d8@mith.ro>

SymbiFlow/symbiflow-rr-graph