Cleans up Core apps for relative(em) to absolute(px) styles.
All Core Styles from em->px, apart from styles.css
Merge branch 'master' into core-em-to-px

Conflicts:
	apps/files_sharing/css/public.css
	apps/user_ldap/css/settings.css
	core/css/multiselect.css
	core/css/share.css
Fixes typo in versions.css
Fixes typos, adds ; wherever not present.
Fixes width of the dropdown menus as per computed styles.
Fixes settings.css and converts more styles.
Merge pull request #5153 from owncloud/core-em-to-px

Cleans up Core apps for relative(em) to absolute(px) styles.