v0.10 - Keyboard control

[ldpercy]

• Added a general document keyboard listener; event propagation is stopped on the command textarea (N.B. actually responding to kbd event characters)
• Added jsconfig with checkJs - fixed initial typing issues, and have started adding JSDoc type annotations
• Updated page item focus - the forms are now focusable, which is visible, and made the focus effect more consistent across elements and browsers
• Also experimented with making the turtle focusable, but had quirks so holding back for now
• Tried out some styles for ninja turtles -> multi turtle
• App breakup - the monolithic turtleApp has been broken apart. Went through a few different iterations, but for now have an MVC-lite arrangement.
• The HTML ui and SVG display have become views - implemented in their own modules, as classes for some of the syntactic niceties
• Now have a separate controller module - this still needs work but it's a step in the right direction
• Have added keyboard controls for: do, clear, origin, cmd tabs, zoom, turtle show & center, page rotation