xcconfig file parsing and evaluation

This kinda works, but is quite limited.

dependencies: [
    .package(url: "https://github.com/mattmassicotte/XCConfig", branch: "main")
]

import XCConfig

let input = """
HELLO = world
"""

let output = Parser().parse(input)

• regexident/XCConfig

I'd love to hear from you! Get in touch via mastodon, an issue, or a pull request.

I prefer collaboration, and would love to find ways to work together if you have a similar project.

I prefer indentation with tabs for improved accessibility. But, I'd rather you use the system you want and make a PR than hesitate because of whitespace.

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