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Change RRG storage to keep (drive pt, direction) instead of (start, end) #2491

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@duck2

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@duck2

The current expansion pruning in the router uses the drive point of every RRNode ((xlow ,ylow) for non-directional nodes). This check is inside a hot loop (in connection_router.cpp), so there may be performance benefits to store (xdrive, ydrive, dir) in the RRG storage, since the router will only fetch two values instead of three + a branch.

For bidir wires (xdrive, ydrive) can be just (xlow, ylow).

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