Refactor ZCam-Controller relationship

[KevinMottashed]

Replace the 1-1 association with observer pattern. This will allow the logger to easily observe the ZCam and log what is happening. This will also avoid any dependencies between the controller and logger.

[KevinMottashed]

Refactored ZCamera-Mediator relationship

The mediator now observes the zcamera.

• moved the video array size constant to the VideoData file
• the zcamera module no longer depends on the mediator module

Closed by a3c912b424130ef62d23230b6625ae9f537424ee Closed by a3c912b424130ef62d23230b6625ae9f537424ee