Adds Block.prototype.mixin() and Blockly.Extensions.registerMixin().
This adds support for a common use pattern in extensions, and adds
error checking to avoid future incompatibilities.
Defer tooltip message string check until after load, when all Blockly.Msg should be loaded.
Avoids validation in headless mode, due to lack of document.readyState.
Moving all `math.js` definitions into a single JSON array, complete with i18n syntax for all messages, dropdowns, and tooltips.
Adding Blockly.Extensions.buildTooltipForDropdown(..) to facilitate the creation and error-checking of tooltips that update based on the value of a dropdown.
Now warn on raw string in JSON 'extensions'.
Replaces old colour block definitions with a Blockly.defineBlocksWithJsonArray(..) call. Generator unit tests continue to load and pass, signifying compatibility with prior block definitions.
Replaces extension 'math_number_tooltip' with the reusable 'parent_tooltip_when_inline' extension, also used by colour_picker. Includes tests.
Adding support for extensions, functions that can assist with loading blocks, much like init functions, but that can be referenced from JSON definitions. This allows JSON definitions to define dynamic blocks such as onchange handlers and mutators.
Rewrote math_number as an example pure JSON block.
