Shadow transparency - Add new variable

[swashbuck]

Currently, the shadow transparency is hard-coded in the theme. It would be useful to have a new variable (ex. @shadow-opacity) to control this.

less/core/loading.less

.loading {
  background-color: fade(@shadow, 50%);

less/core/shadow.less

.shadow {
  background-color: fade(@shadow, 50%);
}

[github-actions]

🎉 This issue has been resolved in version 9.6.11 🎉

The release is available on GitHub release

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