Adding a way of calling contract methods using an Array of ABIParameters

[Nixsm]

This PR adds a new invokeMethod to the contract object allowing the usage of [ABIParameter] instead of the variadic parameters

I also added a simple test for the method to ensure it's functionality.

Oh, this fixes #52

[codecov[bot]]

Codecov Report

Merging #58 into master will decrease coverage by 0.07%. The diff coverage is 50%.

@@            Coverage Diff             @@
##           master      #58      +/-   ##
==========================================
- Coverage   75.14%   75.07%   -0.08%     
==========================================
  Files          64       64              
  Lines        4152     4164      +12     
==========================================
+ Hits         3120     3126       +6     
- Misses       1032     1038       +6

Impacted Files	Coverage Δ
...lasses/ContractABI/Contract/EthereumContract.swift	85.05% <100%> (+0.53%)	:arrow_up:
...lasses/ContractABI/Contract/SolidityFunction.swift	78.16% <33.33%> (-5.18%)	:arrow_down:

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[koraykoska]

@pixelmatrix Could you review this please?

[pixelmatrix]

I left a couple of thoughts. Looks good in general, just a couple of things to consider for future compatibility.

[Nixsm]

Hey @pixelmatrix I've kept the variadic method as it is and updated the new one to have a signature without an underscore

[pixelmatrix]

@Nixsm looks good aside from the test issue I mentioned. If you can update that and if we can get the tests passing I think it's good to go!