VE-654: move wikia tracking into our own file; add tracking for save button.
VE-654: add tracking for edit page impression and publish.
VE-654: add support for tracking with matching dot notation
Merge branch 've-upstream-merge' into ve-tracking
Patch in upstream changes from https://gerrit.wikimedia.org/r/#/c/100834/
Add command and tool tracking.
Add toolbar type to applicable tools; track which toolbar things came from using ga_value; fix some of the event labels.
Add tracking for the MW notice and popup tools
Add tracking for button-publish enable
Better name for toolbar save button enabled flag for tracking purposes.
Make the mediawiki event mapping code a bit more clear.
Merge pull request #2308 from Wikia/ve-tracking

VE-652: fix tracking