* partly fix state_db getCode to get 20 new working GeneralStateTests; remove 2 functions which existed as workarounds; switch all remaining setBalance calls in GeneralStateTestRunner to subBalance (addBalance calls already changed)
* two of the 20 new tests don't work in 32-bit builds
Merge note: currently cannot compile due to `quasiBoolean` (#63). This will be solved by https://github.com/status-im/nimbus/pull/65
----
* Implemented most of the stubbed out state handling instructions
The code compiles, but still fails at the moment due to incorrect
initialization of the VM. Don't merge yet. More commits will be
pushed in the coming days.
* Fixed crash
* trie put and del are void now
* getBlockTransactionData and getReceipts
* Working code for extcodesize0.json
* fix origin.json
* fix calldatasize1
* fix calldataloadSizeTooHighPartial
* fix calldataloadSizeTooHigh
* more efficient PushX implementation
* fix and, or, xor
* Decoupling op logic and gas - introduce gasometer, rework opcode declaration
* Remove gas constants for gas opcode computation
* Remove gas constants for precompiled contracts
* make vm_types compile
* Make opcode, call and computation compile
* Distinguish between dynamic and complex gas costs, fix arithmetic
* Fix context and sha3
* update memory and storage ops
* Log opcode uses memory expansion code
* update/stub system_ops with gas costs
* Make test compile. Deactivate stub test_vm
* all tests compiles, opcode fails due to https://github.com/nim-lang/Nim/issues/8007 (const object variant in tables reset at runtime)
* Create an enum without holes - workaround: https://github.com/nim-lang/Nim/issues/8007
* Use arrays instead of tables for GasCosts, remove some unused imports - passing all basic tests!
* Make test_vm_json compile
* Fix test_vm_json - workaround https://github.com/nim-lang/Nim/issues/8015
* fix memory expansion cost bug
* Remove leftover special handling from before GckMemExpansion
* cleanup outdated comment, better align =
* Fix sha3 gas cost not taking memory expansion into account
* Improve gas error reporting of test_vm_json
* Fix gas computation regression due to mem expansion
* mass replace for memExpansion->RequestedMemSize was too eager
* fix log gas cost (no tests :/)
* missed a static FeeSchedule
* static as expression is fickle