Detect files changed

Starting to look a little less minimal now :)

First, the CLI now detects the DFU package config based on the current working directory (or its parents) similar to git.
Then, the dfu diff command now produces a changes.patch file describing which files were changed by the snapshots.

This is produced in several stages. You start with dfu diff, and then dfu diff --continue as you complete the prompt instructions.

There's other goodies in here, such as:

• the global config isn't needed and can be autopopulated
• Permissions are in a much better place. Instead of things being owned by root when they're not supposed to and vice-versa, dfu now runs as a non-root user always, and then calls sudo as necessary to adjust the permissions

What's Changed

• Implement dfu dist to generate a PKGBUILD file by @intentionally-left-nil in #18
• Dont run as root by @intentionally-left-nil in #19
• Search through all the paths listed in XDG_CONFIG_DIRS by @intentionally-left-nil in #20
• Fix merge logic to propagate the non-null base config by @intentionally-left-nil in #21
• Use user_data_path instead of user_config_path for package data by @intentionally-left-nil in #22
• Create the config.toml by @intentionally-left-nil in #23
• fix exit code for get_all_subvolumes by @intentionally-left-nil in #24
• Fix create config bugs by @intentionally-left-nil in #25
• Create config directories as necessary by @intentionally-left-nil in #26
• permissions issues: Don't resolve the folder before creating it, and … by @intentionally-left-nil in #27
• Ensure that the config files are created with 644 permissions by @intentionally-left-nil in #28
• Run proot with sudo, because the snapshots aren't accessible to non-root by @intentionally-left-nil in #29
• Initialize git when creating a new project by @intentionally-left-nil in #30
• git doesn't like symlinks for gitignore. Use a copy instead by @intentionally-left-nil in #31
• Try calling get_configs without sudo by @intentionally-left-nil in #32
• Create placeholder files when performing a diff by @intentionally-left-nil in #33
• Remove package_dir from the config, in favor of searching parent directories by @intentionally-left-nil in #34
• Add a default gitignore template by @intentionally-left-nil in #35
• Speedup placeholder generation by @intentionally-left-nil in #36
• Create a .dfu-diff file to store the diff progress by @intentionally-left-nil in #37
• Create a base branch with the previous state when producing a diff by @intentionally-left-nil in #38
• Create the target branch by @intentionally-left-nil in #39
• After creating the target branch, switch back to the default branch by @intentionally-left-nil in #40
• Update the base and target branch once successful by @intentionally-left-nil in #41
• Generate the patch file by @intentionally-left-nil in #42
• Add diff instructions by @intentionally-left-nil in #43
• Add unidiff as a dependency by @intentionally-left-nil in #45
• Update the PKGBUILD to include the new files by @intentionally-left-nil in #44

Full Changelog: v0.0.2...v0.0.3