[Done] Pipeline now receives the decoded arguments insted of raw data

[rcmgleite]

This PR changes the signature of the pipeline handler.

The ideia is to make possible for pipelines to access the decoded struct from the message bytes.

Motivation

Make it possible to, for example, create pipelines for struct field validation (see the example added to /examples/demo/pipeline)

TODOs

• Fix examples that used pipelines with the old signature

[cscatolini]

The changes look ok but I'm not sure it will work as intended if you need to convert (actually type assert) interface{} to CreatePlayerCheatArgs or CreatePlayerCheatResponse.

Please add an example with a BeforeFilter using the values received in the CreatePlayerCheatArgs and AfterFilter changing the response.

[coveralls]

Pull Request Test Coverage Report for Build 416

• 6 of 6 (100.0%) changed or added relevant lines in 1 file are covered.
• 10 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.1%) to 75.416%

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Files with Coverage Reduction	New Missed Lines	%
agent/agent.go	10	77.57%

Totals
Change from base Build 410:	-0.1%
Covered Lines:	3718
Relevant Lines:	4930

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💛 - Coveralls

[rcmgleite]

@cscatolini done!

[cscatolini]

Great! Thanks! Is this still WIP? Can we merge this?

[rcmgleite]

It's done!