Better visualize stats/summaries on the call graph

[Domiii]

Three goals:

1. Make stats/summaries more visual by adding icons, tooltips and better formatting
   • → one tooltip for text+icon; should suffice to use title attribute.
   • → use a new function formatNumber for each number
     • → function formatNumber(x) { return x.toLocaleString('en-us'); }
2. Add more/better stats/summaries to call graph nodes.

TODO

• add icon for nTreeContexts (amount of all descendant nodes in subgraph)
  • title = 'Amount of child contexts in subgraph'
• add icon for nTreeStaticContexts (amount of all descendant static contexts in subgraph)
  • title = 'Amount of static contexts involved in subgraph'
• add icon for nTreeFileCalled (amount of files touched in subgraph)
  • title = 'Amount of files involved in subgraph'
• add new stat: nTraces (also w/ icon)
  • title = 'Amount of traces in subgraph. This is a rough measure.'
• add new stat: nPackages (use packageName)
  • rename moduleName to packageName
• also enable these stats for ACG nodes (refactor to use the same code, don't copy+paste)
• add a button to Toolbar to allow toggling stats

More stats (w/ icons):

• amount of static branches (IfStatement, TertiaryExpression, Loop) that were executed
• amount of asynchronous schedulers
• amount of static loop statements that were executed
• amount of static executed lines of code (maybe? → requires some algorithm to accurately count loc)
• allow toggling individual stats: Add "stats" button to Toolbar to control which stats to show on each ContextNode call graph node #478
• label CGRs (call graph roots), indicating what kind of CGR they are (e.g. what kind of asynchronous event scheduled them)