Bump version to trigger GNU ELPA package rebuild

This is in light of commit c922ab4.

Require subr-x at compile time

This is necessary for older versions of Emacs to make 'when-let'
available.

Thanks to Mehdi Khawari for reporting the problem and Nicholas Vollmer
for suggesting this change.  The exchange took place in issue 1 on the
GitHub mirror: <https://github.com/protesilaos/cursory/issues/1>.

Add missing metadata to certain headings

Fix typo in gitignore

Update to version 1.0.0

Update the docs to reflect commit 88820a7

Make presets optionally inherit from another; refactor code

Add README.md file

Update copyright years

Use correct texinfo description in the manual

Add missing property drawers to CHANGELOG.org

Update to version 0.3.0

Update package Commentary

Update links to package sources

Add cursory-presets :blink-cursor-mode property

Speficy cursory-presets :package-version

Speficy cursory-latest-state-file :package-version

Add info link to cursory defgroup

Implement fallback value for cursory-presets

Refine default value of prompt

Use the previous one from the history, if available.