Moved processed metrics computation to DataTableGenericFilter, removed new filters & implemented as methods in Report to avoid confusion regarding re-use, allow adding processed metrics as DataTable metadata and use this to rewrite AddProcessedMetrics filter, correct name of Metrics::getMappingFromIdToName function, added placeholder AggregatedMetric class for future, revise Metric/ProcessedMetric hierarchy (add methods for translation/etc.), allow .get API methods to use metadata to automatically figure out which columns to select, get EcommerceOrderWithItemsTest to pass.

coding style fixes, some PHPStorm inspection fixes, improved readability of code, few refactorings, all as part of our code cleanup strategy

refs #3490 Throw meaningful error when userId segment is used with an unsupported segment match operator + test

Use suggested values callback in getSuggestedValuesForSegment API method.

Fixes #5804  API.getPiwikVersion should be available to anonymous user when anonymous user has some 'view' access

by checking for dimension version changes only if there was a file change we gain another 100ms or more per page request. Otherwise we would have to load all dimensions on each request just to check for new version

moved some more dimensions to plugins, fixed some issues, removed some more duplicated code etc. Tests will not be green as there fixes to country detection

starting to refactor reports into classes, also refactored some more dimensions which is still not 100% working and needs more work

Piwik is a free/libre analytics platform. Refs #4455 GNU Package requirement to use free/libre instead of open source

refs #5192 continued menu refactoring. not sure yet how good this idea is but seems to be already better than before

using phpstorm optimize imports feature

using phpstorm optimize imports feature

UserAgentParserEnhanced is now required and used from it's own composer package (piwik/device-detector); additionally Spyc library is required as composer package and removed from piwik source