New modular component design and components to go with it

[ajfisher]

Comprises a set of modifications to do the following:

• make all of the blocks and generators that are used defined by the exercise in the workshop to remove those that are not needed (and allow building of complexity over exercises)
• group like blocks together in the toolbox in order to minimise clutter.
• Include the ability to use predefined blockly blocks (eg logic_if) as well as robotnik blocks (eg Servo).
• Each component now produces one or multiple blocks and generators depending on it's capability.
• Upgrade of lodash dependency

Components now supported:

• Sensor
• Button
• Temperature
• Servo (standard and continuous)
• Motor
• Led
• Led.RGB