Add battery icons

Summary: Adds battery icons at 16, 22 and 32 px. Includes symlinks for symbolic icons and standard icon names for compatibility with 3rd parties. Adds status/32 to index.theme. Changes status/22 and status/22@2x from Scalable to Fixed. Requested by @hein for drone control app.

Test Plan:

Reviewers: VDG, hein, ngraham

Reviewed By: VDG, ngraham

Subscribers: broulik, ngraham, filipf, trickyricky26, kde-frameworks-devel, hein

Tags: Frameworks

Differential Revision: https://phabricator.kde.org/D18940