(#53) Styling buttons: refactored animation for busy state

Conflicts:
	CHANGELOG.md
	scss/laxar_uikit/_mapping_status_classes.scss
	themes/default.theme/css/theme.css
Merge branch 'feature-0.11.x/52-styling-buttons--refactor-animation-for-busy-state' into release-0.11.x

* feature-0.11.x/52-styling-buttons--refactor-animation-for-busy-state:
  (#53) Styling buttons: refactored animation for busy state