New widgets, updated and cleaned up examples

New Widgets Include:

• box-plot
• heat map
• rectangle port diagrams
• gradient legends

Made the WebGL renderer the default for flame charts
Disabled Web Workers by default as they introduce latency except in bigger data cases

Examples

• Add MinMaxValue example
• Separate examples from framework samples for documentation purposes

Fix computation bug in TraceStateDecimcator
Allow negative values in bar charts
Various performance improvements