Added a new keyword to `use-package`, `:spacediminish` which calls
`spacemacs|diminish`.
Supported patterns:
- nil
- SYMBOL
- STRING
- (SYMBOL STRING)
- (STRING STRING)
- (SYMBOL STRING STRING)
- List of patterns above
When `SYMBOL` is missing, it's inferred from the package name, e.g
`(use-package foo :spacediminish nil)` becomes
`(use-package foo :spacediminish foo-mode)`.
This PR aims to replace explict calls to `spacemacs|diminish` and brings more
declarative flavour to layer configuration.
For example, the following form
```elisp
(use-package highlight-indentation
:config
(progn
(spacemacs|diminish highlight-indentation-mode " ⓗi" " hi")
(spacemacs|diminish
highlight-indentation-current-column-mode " ⓗc" " hc")))
```
can be replaced by
```elisp
(use-package highlight-indentation
:spacediminish ((" ⓗi" " hi")
(highlight-indentation-current-column-mode " ⓗc" " hc")))
```
4836a2569b