Refs #4041, added  parameter to Archive::getDataTableExpanded so entire tree will not be created if not necessary.

Refs #4040, #4041, removed ViewDataTable::init & moved default property values for core properties to Properties class.

Refs #4041, #4040 add new CoreVisualizations plugin and move HtmlTable, Cloud & JqplotGraph visualizations to it and improve UIIntegration test debug output.

Refs #4040, #4041, move visualization only view properties to separate visualizations, changed JavaScript properties to 'client side parameters' and 'overridable properties' to 'client side properties', changed keep_summary_row from a JavaScript property to a client side property, allowed visualization properties to be inherited, fixed system that allowed visualizations to set custom defaults for property values, modified behavior of datatable_css_class viewdatatable property, allow view properties to be customized in metadata based on the visualization used, and tweaks to UI Integration tests.

Refs #4040, #4041, move AllColumns ViewDataTable & Goals ViewDataTable logic to HtmlTable visualization class & remove those classes. Revised the way visualizations default/override view properties. Cleaned up the ViewDataTable class a bit. Added base type for datatable visualizations.

Added namespaces to functions.php files in the five plugins that had one
Work in progress

Refs #4040, #4041 removed rest of viewdatatable set/get/enable/disable property functions, did the same for all other ViewDataTable classes, moved most of ViewDataTable/HtmlTable logic to visualization instead of main class and re-add links for UI integration tests.

renaming Unzip to Uncompress,
Renaming Tracker/Referer to Tracker/Referrer,
and few more

Refs #4041, modify tag cloud ViewDataTable to use _dataTable.twig w/ Visualization_Cloud as visualization..

Removed many Piwik_ functions, in Piwik 2 it is best practise to use the methods calls instead

Todo: finish converting core/ classes + convert plugins/ classes to use \Piwik\Plugin namespace + fix build + Merge master

Refs #4059 Work in progress: Conversion to use Namespaces: Period*, Metrics, Segment, SegmentExpression, PluginsManager.
Removed some deprecated code.

Converting Access & Auth to namespace

Notes:
 - Removed colors.piwik.json loading code. No longer necessary.
 - UserCountryMap is the only remaining portion of Piwik that doesn't use this technique. Not yet, anyway.

Notice that auto refactoring has created a nested namespace. Not sure this is what we want - so we might have to edit those nested namespaces afterwards (I think they don't look so good)

Notice that auto refactoring has created a nested namespace. Not sure this is what we want - so we might have to edit those nested namespaces afterwards (I think they don't look so good)

2 steps required:

1. Refactor > Move > \Piwik\Core\Config (uncheck "Create new File")
2. Refactor > Rename > Piwik_Config to Config