* core/state, cmd/geth: streaming json output dump cmd + optional code+storage
* dump: add option to continue even if preimages are missing
* core, evm: lint nits
* cmd: use local flags for dump, omit empty code/storage
* core/state: fix state dump test
* cmd/evm: adds ability to run individual state test file
* cmd/evm: Fix statetest runner to be more json friendly
* cmd/evm, tests: minor polishes, dump state on fail