Emacs: cursory version 0.3.0

Cursory provides a thin wrapper around built-in variables that affect the style of the Emacs cursor. The intent is to allow the user to define preset configurations such as “block with slow blinking” or “bar with fast blinking” and set them on demand.

Package name (GNU ELPA): cursory
Official manual: https://protesilaos.com/emacs/cursory
Change log: https://protesilaos.com/emacs/cursory-changelog
Git repo on SourceHut: https://git.sr.ht/~protesilaos/cursory
- Mirrors:
  - GitHub: https://github.com/protesilaos/cursory
  - GitLab: https://gitlab.com/protesilaos/cursory
Mailing list: https://lists.sr.ht/~protesilaos/cursory

Below are the release notes.

Implemented a mechanism to read fallback values for the presets specified in the user option cursory-presets. In practical terms, there can now be a t preset which holds the default values. Any other named preset overrides the t, so it only needs to specify the properties that differ from the defaults. Sample using the original value:

(setq cursory-presets
      '((box
         :blink-cursor-interval 0.8)
        (box-no-blink
         :blink-cursor-mode -1)
        (bar
         :cursor-type (bar . 2)
         :blink-cursor-interval 0.5)
        (underscore
         :cursor-type (hbar . 3)
         :blink-cursor-blinks 50)
        (t ; the default values
         :cursor-type box
         :cursor-in-non-selected-windows hollow
         :blink-cursor-mode 1
         :blink-cursor-blinks 10
         :blink-cursor-interval 0.2
         :blink-cursor-delay 0.2)))

Expanded the available properties of the user option cursory-presets to accept a value for the :blink-cursor-mode key (as seen in the above code block). It is either 1 or -1 and is passed to the function blink-cursor-mode. The former value enables the mode, the latter disables it. This lets cursory-presets set the blink-cursor-mode per stylistic variant.
Refined the default value of the minibuffer prompt that is used by the command cursory-set-preset. The default value now is the previous element in the history, if it exists. This makes it easier to toggle between the last two choices (select the default value simply by pressing RET without any further input).
Specified a :package-version for all user options. The user is informed in relevant Help buffers about the last version that introduced or iterated on the variable.
The cursory group now references the Info manual that ships with the GNU ELPA package. A link is shown in Custom UI buffers.