Support wildcards for data lookup

[janbridley]

Description

__getitem__, get_from_pairs, and get_from_loops now support "?" and "*" wildcards. This functionality is built in to python's fnmatch module, which is used under the hood for these queries. The full unix-style pattern matching is not supported (specifically "[xyz]" and "[!xyz]" patterns), as cif keys commonly contain bracket characters.

Motivation and Context

The box and lattice_vectors properties made an implicit assumption that files used the CIF format for the lookup keys. This assumption is no longer required, as "_cell_length_alpha" and "_cell.length_angle" can now be easily matched with "_cell?length_alpha".

Types of Changes

• Documentation update
• Bug fix
• New feature
• Breaking change¹

¹The change breaks (or has the potential to break) existing functionality and should be merged into the breaking branch

Checklist:

• I am familiar with the Development Guidelines
• The changes introduced by this pull request are covered by existing or newly introduced tests.
• I have updated the changelog and added my name to the credits.