Scratch folder for temporary data moves when using profiles

[MrHedmad]

Currently, the logic for applying profiles is as follows:

• Get which files have to be moved;
• Move originals to **/*.original;
• Move temporary to originals;
• Run the workflow;
• Revert the profile.

This PR changes this to:

• Get which files have to be moved;
• Move originals to .kerblam/scratch/*.<random salt>;
• Move temporary to originals;
• Run the workflow;
• Revert the profile.

This has two benefits:

• First, we can fix Mask files in profiles #76, by simply omitting to move the temporary files to the originals;
• Second, it makes sense that the original files would "disappear" when running a profile: you might list all files in a folder, and in the current implementation you would find the *.original still in the directory, which you might not be expecting.

While the second benefit might not be too useful, it might still be a desirable functionality.

TODO

Before merging, tick all of these boxes:

• cargo test -- --include-ignored passes without errors or warnings.
• The CHANGELOG.md has been updated to reflect these changes.
• Documentation is updated that reflect these changes, or this PR changes nothing that is reflected in the docs.
• @all-contributors is made aware of this PR, or I am already in the all contributors list.

[MrHedmad]

This now both fixes #76 and implements the logical changes, all in one package.