Set max line length to 160 (eventual target 120). #366
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Description
Added new checkstyle rule for max line length of 160; with the view to, eventually, make it around 120. I will create another PR with the rest of the changes from #358 once this is merged as it should make merging slightly easier.
Hopefully reducing the scope and splitting this into commits that each change a separate thing will help merging - let me know if it's too much and I could split further if required.
Motivation and Context
This PR will prevent any extra long lines and extra long anonymous inner classes being accidentally added.
Checklist: