Field colour: add block definitions

[rachel-fenichel]

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Component

Colour field

Request

Copy block definitions into the plugin:

• Colour picker, random colour, RGB colour, blend

Copy in any tooltips, mutators, extensions, and styles

• Including parent_tooltip_when_inline

Provide install functions for each block, which install all fields, mutators, and extensions necessary to use that block.

Provide an installAll function for all blocks in the plugin

• Call each individual block function

Provide any functions needed for the language generator for each block, including reserved words

[rachel-fenichel]

Closed by #2162