Separate pylint run for files under angr/procedures

[rhelmot]

We should have a separate pylintrc and pylint process for files under angr/procedures. Specifically, we should disable arguments-differ,unused-argument,no-self-use,missing-module-docstring,attribute-defined-outside-init while linting simprocedures.

[twizmwazin]

Ideally we should see if there is a way to do this in a single pylintrc so that the local setup wouldn't be complicated by a change like this. Even if we were to provide a script for manual linting, that wouldn't automatically translate well into editor configurations.

[twizmwazin]

An update on this, I've looked to see if pylint can support separate rules natively. Currently it cannot, but efforts to fix that are being tracked here, though I'm not sure what the rate of progress is.