* update ChainDAG.effective_balance() to use StateData; rm unused ChainDAG.getBlockByPreciseSlot() * update get_effective_balances to avoid god object; avoid most memory allocation in Altair epoch reward and penalty processing
* bump nim-eth2-vendors and use v1.1.0-alpha6 test vectors * continue to download alpha 5 test vectors for const sanity checks
* reorganize SSZ-based tests to support phase0 and altair * label Altair SSZ consensus object tests as such * update test summary
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