Clean up code style (#29)

* Rename scopes to remove underscore

* Fix style issues

* Replace longform array syntax with short form

* One more style fix

* Remove commented code

* Make all internal methods protected

* Remove unnecessary wrapping

* Move duplicate code to findPreviousFunctionPtr

* Clean up comment blocks

* Remove unnecessary function def wrapping

* Remove return types

Safer for older PHP versions for now

* Clean up multi-line conditions

Author: sirbrillig