[zcash/zcash] Set Sapling mainnet activation height (#3469)

In mainnet, block #419000 is expected to appear on October 28, 2018, Zcash’s birthday.

In testnet, block #280000 is expected about a week from now. (Current height is ~275249, plus 4032 blocks for a week, plus a little more just to make the number nice.)

These are the activation heights for Sapling in mainnet and testnet, respectively. Protocol version is also changed.
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— Commit Summary —

* Sapling mainnet activation height

— File Changes —

M src/chainparams.cpp (5)
M src/version.h (2)

— Patch Links —


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