Extend precompiled contract to execute subsequent EVM code call in context #106
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This extends precompiled contract to add a second kind. For this kind of precompiled contracts, it returns subsequent EVM codes (with inputs) that is executed within the same context as the precompile. This "subsequent EVM code" has the full ability as a normal EVM contract and can modify states it is allowed to modify (issue other calls, create contracts, or modify the storage of the precompile).
This allows us to support use cases such as #105 without exposing too much internal state, which, if messed up, can actually cause the EVM to panic (for example, accidentally make the call stack unbalanced).