The abi package already supports function overload by adding a suffix to the overloaded function name, but it uses the function name with suffix to calculate signature(both for the event and method).
This PR fixes it by adding a new field named RawName, which can be used to calcuate all signatures but use Name to distinguish different overloaded function.
+ The event slice unpacker doesn't correctly extract element from the
slice. The indexed arguments are not ignored as they should be
(the data offset should not include the indexed arguments).
+ The `Elem()` call in the slice unpack doesn't work.
The Slice related tests fails because of that.
+ the check in the loop are suboptimal and have been extracted
out of the loop.
+ extracted common code from event and method tupleUnpack
The runtime environment can be used for simple basic execution of
contract code without the requirement of setting up a full stack and
operates fully in memory.