Fix ruleset to run on my system
Remove the installation folder from most exceptions
Changes to ruleset dealing with libraries/cms

- Added Platform files to exclude list; they should pass Platform codestyle rules anyways
- Added the images and media folders to permanent exclude lists, speeds up parsing locally
- Added *.less files to excludes for the same reason

With these changes, I went from running phpcs for almost 10 minutes to just under 4.
Remove includes folder from exceptions
Remove exceptions for class name formatting