Rewrite bokehjs in TypeScript

[mattpap]

This is a meta issue for moving bokehjs from coffeescript to typescript.

Module status:

• api
• core
  • layout
  • util
• models
  • annotations
  • axes
  • callbacks
  • canvas
  • expressions
  • filters
  • formatters
  • glyphs
    • webgl
  • graphs
  • grids
  • layouts
  • mappers
  • markers
  • plots
  • ranges
  • renderers
  • scales
  • sources
  • tickers
  • tiles
  • tools
    • toolbars
  • transforms
  • widgets
    • tables
• client
• protocol
• document
• embed

[mattpap]

btw. If anyone else would like to join in, then make sure to commit all changes in two stages. First commit rename from path/file.coffee to path/file.ts and then commit changes necessary to make that file compile. This helps git to maintain history of renamed files.

[bryevdv]

@mattpap just FYI there are some outside folks potentially interested in helping parallelize this effort after the low level core classes are done, so just request to keep this issue updated with progress as things go.