mark-callable-contracts rule is firing a false positive on emitting events

[habdelra]

The mark-callable-contracts rule is being triggered against emitting events, as events are camel-cased very similarly to contracts. We should update this rule so that it does not get triggered by emitting an event. Take for instance this example:

contract A {
  event UpdatedToken();

  function b() public {
    emit UpdatedToken(); // This line triggers mark-callable-contracts
  }

}