fix internal procedure's calls not showing up in call graphs

[JosephWood2001]

procedures that are internal to a procedure will now show their calls in call graphs.

[ZedThree]

Does this obey the proc_internals setting?

[JosephWood2001]

Whoops, I didn't try this setting when doing my first commit.

looking into it, when proc_internals was off, the internal calls wouldn't show up in the call graphs 👍 , but the calls made by the internal calls wouldn't show up for the parent of the internal calls either 👎 (both before and after my first commit).

This commit fixes that issue by skipping over internal nodes that aren't 'visible'

[ZedThree]

Thanks @JosephWood2001 ! Please could you add a test or two for this?

[JosephWood2001]

👍 , I've also moved where/how the internal proc calls are added to the all calls graph to a more appropriate spot.

[ZedThree]

Lovely, thanks!