Prevent modal screen overflow

fixes #288
Add placeholder files for lite charting API for JVM plugins
Make basic Lines rendered as Plot
Make charting api and serializer for plotitem Area
Add Bars Points Stems plotitems and serializers
Rename PlotSerializer to XYChartSerializer
Add CombinedPlot
Fix a typo in CombinedPlot serializer
Add Crosshair, also fix a bug about using setColor in Groovy
Add the basic chart tutorial
Merge from origin/master
Revert debug code
Merge pull request #596 from twosigma/alee/chart

TS Charting API Lite