Summary: Converted ReactDevTools to Sandy, no real semantic changes. Will add those in next diffs. Made some minor flow optimizations. The port forwarding setup interacted directly with the Flipper store, so made an escape hatch for that. Will clean that up again in next diffs. Reviewed By: passy Differential Revision: D28380055 fbshipit-source-id: 053979fd10bf3b62089a4f1e27b0e02b4b05e2e1