plumbing is the flocks mixin which handles all of the behind-the-scenes work to make flocks function. The mixin is automatically added by calling flocks.createClass, or you can add it yourself in the standard mixin fashion if you prefer.
Describes the context types provided by the React component; mixin hook notes that this provides flocks2context : object to subordinate controls.
Describes the context types accepted or required by any given React component; mixin hook notes the need for flocks2context : object as an incoming context to pay attention to.
Called when the control is about to mount; mixin hooks this event to add the flocks context this.fctx, the flocks updater
this.fset, and other flocks methods to the control object.
Called when the control is about to pass context to children; the plumbing mixin hooks this event to do the simple job of passing the flocks context data downwards.