User agents detection needs updating / refining

[jesusbagpuss]

Main issue is that Chrome is being under-reported.
I think this may be to the use of a hash to store regex => group, but when processing the hash, the order in which the elements are returned is random.

This means that sometimes, when the 'Safari' entry is checked first, modern Chrome browsers (with a useragent like Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36) will be returned as 'Safari' rather than Chrome.

File: lib/plugins/EPrints/Plugin/Stats/Processor/Access/Browsers.pm

[jesusbagpuss]

Could use e.g. https://github.com/ua-parser/uap-perl for detection - also would allow OS detections and other metrics.