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Argument parser version bump (@nk-5)

Support Swift 5.5 (@uhooi, @ryogabarbie)

• Now supports Combine variables (@milettal)
• Supports modifiers (weak, dynamic) via annotation (@tinder-maxwellelliott)
• Argument parsing improvements (@pejato)
• Build configs / CI improvements (@uhooi)

1. Cleanup dependencies (remove unused Swift Argument Parser and update SwiftSyntax version)
2. Reconfigure CI builds

1. Version update with latest Xcode 12.5
2. Build configs updates
3. File cleanup

1. Remove var initialization if overridden
2. Remove duplicate access levels of processed typealias models

Supports setting callcount vars manually via an input option: --allow-set-callcount.

Check for output file content added to prevent redundant writing.

• Fix: Escaping handler is now removed from argument history.
• Functions with generic where clauses are now supported.

-Version update: Swift 5.3 / Xcode 12.0 -Support an input option to apply a 'final' attribute to mocked classes -Render mocked vars with private(set) where applicable