Fix explicit .self errors in Xcode 11

[jojost1]

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Description

Adds some explicit self.

Motivation and Context

Fixes issue #157

How Has This Been Tested?

No functional changes, only extra references to self. Builds fine.

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Non-functional change (Updating Documentation, CI automation, etc..)

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.

[jojost1]

@AppPear any chance you could merge this one?