[TASK] Replace Google Image Charts

Flot.js added, FlotPie.js added, Demo HTML file added
[TASK] Replace Google Image Charts

Begin with powermail integration, extended JavaScript to work with data-attributes
[TASK] Replace Google Image Charts

Rewrite GetLabelsGoogleChartsViewHelper and added a unit test for this
[TASK] Replace Google Image Charts

Rewrite GetValuesGoogleChartsViewHelper and added a unit test for this
[TASK] Replace Google Image Charts

Integrated flot.js for all marketing reports
[TASK] Replace Google Image Charts

Integrated flot.js for all form reports
Merge branch '64019_remove_google_charts' into develop