Ignore function call arguments on static declarations processing (#272)

[arkener]

Provides a fix for #272, adding the following:

• Add check if static declaration is called from within a function call, skipping it if this is the case.
• Add a test to check for static initializer methods, mostly calling the __construct()
• Add a test for static closure usage.

This fix doesn't feel like a 100% fix, as the main issue seems to be that the static declaration check sometimes picks up static definitions outside of it's prospected scope. This mostly shows up with static function calls.

Fixes #272

[sirbrillig]

Thank you!

This fix doesn't feel like a 100% fix

The most important thing is that we increase the test cases as you've done here so that if things are refactored we prevent these issues from happening again.