Converts em to px values for styles in Files.
Merge branch 'master' into files-em-to-px

Conflicts:
	apps/files/css/files.css
Fixes Trashbin and Files Style Conflicts, more em to px conversions post rebase
Fixed files row height in Firefox/KDE

Firefox is using native checkboxes and in KDE the checkboxes have a
bigger height which caused the row height to increase and be misaligned
with the date column.

This fix makes the checkbox absolute to prevent it to influence the row
height.
Fixes header going down in trash bin app.
Removes Bogus classes from previous commits.
Removes Bogus Styles.
remove comment & add space
Keep the EOF-Newline
Merge pull request #5152 from owncloud/files-em-to-px

Converts em to px values for styles in Files.