* All files follow the template
* Removed trailing whitespace from end of lines
* Removed newline at end of file
* `xlink` used for maximum compatibility
* Bit of newline trimming
* Replaced duplicate paths to reduce size by adding use
Made use of the 'use' svg tag and translate rotate to reduce the file size
* Updated readme to reflect new Slack logo size
* Removed defs and combined paths
* Updated readme to reflect new Slack icon size
* Gives a consistent header to all images
* Makes future changes easier to see
* Some images slightly smaller
* Some images use SVG2 features (`href`)
* Most images smaller or the same size
* A few images slightly larger
